What engine do you have?
What kind of mods do you have?
What kind of car?
How much does you gas tank hold?
What kind of gas do you use?
Also if your particualr with what brand mention it to.
and most importantly do you do HIGHWAY or city driving? and how do you drive?
I think this will help alot of people.
and there's a poll to see what gas people use.


I get 280-330 on a full tank. Mostly highway....but i go the avg of
80-100 mph. and the rpm is at 4000....and sometimes i go 120 ant the rpm is at 5000....I have 99 ciivc ex.....

my brothers 92 civic sedan with jdm b16a (i/e mods) can do 450-500km on a full tank of 98 RON fuel (sometimes with octane booster). the car is daily driven and is giving a beating at lots of red lights. he drives on highway and city frequently.

d16z6, get about 26mpg. I drive a lot of country roads going 75mph+

D16Y7
Rear 1/3 exhaust, K&N drop in filter
1997 Honda Civic DX
11 Gallons 93 octane
Mobile
50/50 split between highway and city driving.

The best I've gotten is 310 miles to a Tank, but I on'y did it once, since then, I've never been able to re-create it, my acterage is about 260 miles to a tank.

stock 95 EX engine (Whats the code for this?)
ram air intake
average of 200 miles to a tank. I never empty one past 13 dollars though. So I refill about every 7-9 gallons.
average about 25-26 mpg
89 octane
strictly city driving. No freeways, no highways, no open back country roads. I drive it soft mostly, sometimes hard. Its an automatic.

I drive a 2000 Honda Civic Si (B16A2)
Approximately 11 gallon tank and I get about 315 miles out of it but I fill her up before I get that No Fuel light comes on. That calculates to about 28.6 mpg. For now my only mod is my Greddy Evolution Cat-Back Exhaust and a drop in K&N air filter that doesn't do shit.:toothless Oh, I use Premium (93 octane).

I have a stock 95 Civic EX with 143,900 miles on it and I still get about 31 miles to a gallon. I drive about 50/50 city/highway and I drive it average (not to hard, not too soft). I have a system and a drop in K&N, thats about it. I use 89 or 93 octane depending on my money situation. Can someone tell me why I am still getting 31 miles to a gallon and everyone else is getting like 26-28??

I drive a 2000 civic ex, and i get about 220 miles to a tank (on average) and get anywhere from 24-28 mpg, but it's usually more towards the 24, depending on how much i drive the freeway, and how hard i drive it. My mileage may be a bit skewed though, because the town i live in is built into a bunch of hills, meaning a lot of uphill driving. I split my time about 60/40 city/highway

I get about 190 out of my 96 civic, but i only fill it up early cuz my car starts up funny when its low on fuel. This happen to anyone else?

Originally posted by JimsCivicEX
I have a stock 95 Civic EX with 143,900 miles on it and I still get about 31 miles to a gallon. I drive about 50/50 city/highway and I drive it average (not to hard, not too soft). I have a system and a drop in K&N, thats about it. I use 89 or 93 octane depending on my money situation. Can someone tell me why I am still getting 31 miles to a gallon and everyone else is getting like 26-28??

donno but i am in the same place as you... 94 civic coupe EX i drive it hard on the streets but cruise at 70-75 on the freeway... its a 12gallon tank and manual. i get 300 to a tank with harder city driving and 350 on a 75/25 highway/city split... on my trip to seattle for HIN i should be able to pull something like 375-400... lol IF i can keep only going 75... i know i will be going faster then that.
oh yeah. no mods... cept my cracked airbox... but thats it:smoka:

500km on a tank...
2002 civic sedan, no mods

D16Z6 (95 EX coupe)
Mods: Tenzo Short Ram, DC 4-2-1 CC header, custom cat-back to a Nakayama canister, B&M Commandflo FPR, Jacobs/MSD ignition setup, Accel wires and NGK plugs (thats it as far as power mods)
<-----
a little over 10 gallons
93 octane
50% city, 50% highway
I drive hard
I only get about 230 miles per tank, but without a low level indicator, I usually only hit 220

I get about 375 miles in the DX..usually about 330 miles in the EX...ahh...the hatch...about 245 miles:D

minus 45 miles now because I'm 100% city driving:D

you fockers must really rag the hell out of your cars:flipa:

375!!!!??!?!?!? what you dont rev ur engine over 2000 rpm???

D16Y8
I/H/E
96 Civic EX coupe
stock gas tank volume

BP/Mobil (87 octane); Considering that gas/fuel technology has progressed quite a bit (detergents and the like), I see no reason to warrant paying for higher octane unless I choose to advance my timing or bump up the compression since my car is "close" to stock.

I consider myself as a defensive aggressive driver. :D (On the streets, I drive pretty conservatively.) I drive a bit more in the city than I drive the expressway.
I stopped taking tabs on my mileage but, it's consistently 200+ at the 1/4 mark.

i got a 91 crx, i/h/e K&N, new plugs/wires, with 90k miles on it, highway i get about 235-300 per 11.8gal tank.

city i get about 200-220.

95 cvcc vx-- 60/40 highway city-- i/h/e K&N -- ignition upgrade coil spark plug & wire-- 87 octane 5-30 motor oil both name brand-- over 35 in the city close to 50 on the highway-- the most i hit was 360 miles but had some fuel left-- low was 280miles-- i avg little bit over 300miles with 1 to 2 gallons left--holds 10 gallons. please dont ask why i mod up that slow azz engine :rolleyes: :confused:

I got a 99 DX, and I used to use premium all the time.
I filled up once using regular and never turned back.

My car is mostly stock (i/e) but when I first used regular it seemed like the engine performed a little better! I know that sounds like a load but I'm telling you. I wouldn't have stuck with it if my performance went down at all.

IMHO 92 octane in a mostly stock 4cyl, naturally aspirated engine is a waste of money. Alot of people who swear by it have never used regular ever. ( I used to be one.:rolleyes: )

All you 92octane guys try a fillup with regular and I bet you won't feel a difference except maybe a positive one. (Considering a modestly tuned engine and name brand gas)

Back to topic: 26-32mpg (75% city miles)

b18b block/b16a head
mods listed below...some missing though...
94 integra

lately ive been using 89. i try to go with 93, but its like 1.87 here...and i cant deal with that right now...i need a job. stick with shell. usualy i do mostly highway driving, ive gone almost 330mi on a tank. average about 300.

my best ever in my 93 ex is 35.4 HA. but i everage 32 or so. and yes i usually shift about 2 or so unless i need to go faster witch i usually dont. i prob drive about 50/50 maybe a little more highway. all i have is exhaust

97 civic ex totally stock
bout 300 a tank

and about the octane of the gas i read that higher octane in an engine that only needs the lowest octane does nothing except wast ur money from buying it, is this tru or false please tell me :confused:

Nissan Skyline R33 GTS 25t
2.5L turbo
3” catless exhaust and Trust Airinx pod filter
60 Litre tank
I use 98 octane petrol (either BP Ultimate or Mobil Synergy 8000)
City driving mainly – bumper to bumper traffic
I get about 220 miles per tank (although I never let the tank get totally empty, so that’s for about 50 Litres).

Oops sorry I didn’t realise this was in the Honda section. I thought it was in general. Just ignore my last post.

Could someone please explain to me why I keep seeing:

Mods:

K&N filter, Exhaust.
Fill up 93 octane :confused:

Originally posted by Rice-Rocketeer
Could someone please explain to me why I keep seeing:

Mods:

K&N filter, Exhaust.
Fill up 93 octane :confused:

Exactly.

d16z6
I/H/E
92 civic hb si
5 speed
mostly highway
11 gal.
60-70mph 400miles, 80-90mph 350miles
if i get into a draft with other cars at 80-90mph i can go 400miles
just turned 235,000 miles today.:sun:

ha

About 550kms on 98 octane....mainly city driving. 2001 civic sedan

I have a 92 civic hatchback dx w/ only a cold air intake and 16" rims... i generally get about 300-320 miles per full gallon... i think it's a 10 gallon...

I used to only get to about 200-220 on my STOCK D16y8, now I get like 250-260, Dont know how, but just glad I do!! :D ....

Does anyone else in their honda's get this?... When ur ALMOST at "E" ur car has a little trouble starting up? I've been in 3 hondas where this happens, is it just i've been in 3 bad hondas or, does this happen to all?? This doesnt happen on any other car i've been in. Thanks! :cool:

my ride does the samething and when i fill it up its still remains 2-3 gallsn of gas.

Naw when I fill up it goes away...but does anyone know why this happens on hondas?

99 Civic Ex Coupe
5 Speed
K&N Typhoon Intake
Apexi WS Exhaust
17in Motegi MR7's
Hankook Ventus HR2's
205-40's

I use Amoco Gold and I do both Highway and city and I have to say I am in the neighborhood of 250-280 mpg, Depending on how I am driving.

my bad let rewrite what i just said, my cars has a hard time as well when it gets low and i have 2-3 gallons left in the tank, but when i fill it back up there no problem. Maybe honda has a week fuel pump that needs more pressure to the engine to start the car up. I need to find out cuz its never good on fuel injection to stall so many times.

I use Amoco Gold and I do both Highway and city and I have to say I am in the neighborhood of 250-280 mpg, Depending on how I am driving.

wow that must be nice to get 250-280 Miles Per Gallon so you can drive what 2800 miles to a tank thats nice is that one of them water engines.:hehe: :jump: :hehehe: :rolleyes:

Originally posted by iLLuCiv99
I used to only get to about 200-220 on my STOCK D16y8, now I get like 250-260, Dont know how, but just glad I do!! :D ....

Does anyone else in their honda's get this?... When ur ALMOST at "E" ur car has a little trouble starting up? I've been in 3 hondas where this happens, is it just i've been in 3 bad hondas or, does this happen to all?? This doesnt happen on any other car i've been in. Thanks! :cool:

yep happens to me at first i thought my car was just a peice but i figured it out

Originally posted by onesojourner


yep happens to me at first i thought my car was just a peice but i figured it out


what'd u figure out? :confused: Is this normal on everyones car?! Does this mess up the car in any way? I'm always scared the my damn car wont start up :rolleyes:

funny u say that now cuz my car wont start. Car has a full tank of gas theres a green shade in the battery and it still has some charge cuz when i jumped it the lights, fogs, and radio play but the car wont turn over at all not even a little. I hear the fuel pump thats working find. I was thinking it could be the starter but it did not show any signs of going bad. My neighbor and I was thinking it might be the safty switch to the clutch. Any advise????anyone

my highest was 320 miles on one tank in my 88 accord lxi and i didn't even let it go till the red light so it probably would have gone higher.

best i've gotten was 390 miles in my 91 STD all on highway. worst like 180 lol it was on way to auto-X near New York City pretty much did oh 100 the whole way ran like 7 runs and hauled ass back. Tank was on fumes lol.

What engine do you have? -- d17
What kind of mods do you have? -- bone stock
What kind of car? -- civic LX
How much does you gas tank hold? -- 13.2 gallons
What kind of gas do you use? -- 91 (highest in our area)
Also if your particualr with what brand mention it to. -- shell
and most importantly do you do HIGHWAY or city driving? and how do you drive? -- 90% freeway driving and 10% city driving

gone 400 miles from full tank to like 2 gallons left.

Engine- D16Y8
~ 10 gallon tank.
1998 Civic EX
Goes 180 to 220 per tank.
Using 95 Octane gas.
Mods- to many to list. The honda guzzeler (http://www.cardomain.com/id/98civicrider)
Mostly highway driving 80% highway, 20% city, but I do take off pretty fast whenever I get a chance.

Maybe if I baby it, it could get 25mpg.

guys guys guys... this post was like a year and a half old

it was? i didnt notice. just popped up from the most recent posts.

On highways, averaging about 85 mph - 350 miles per tank D15B7

damn your right this thread is starting to spourt pubes its that old. LOL i'm same as mycivic i saw as last posted thread

99 Civic DX
D16Y7
eBay cold air intake, OBX 4-2-1 header, Tanabe Racing Medallion catback exhaust, AEM cam gear, AEM pulleys, OBX 10.5 mm spark plug wires
I run 93 octane due to advanced timing, 94 or better sometimes when I can get it.
From driving back and forth to work 5 days a week, about 40 miles total, some highway, I usually get anywhere from 28 to 33 mpg. I drove out to my grandmother's a few times, which is about 220+ miles one way, and managed to make the trip there and back on the same tank of gas. Best gas mileage was 46.7 mpg.

Shit, this thread is old.

1992 LX Automatic 30% city and 70% highway. I get 220 miles to the tank. Why am I getting shitty milage? My car has 99,000 miles on it. I met someone with a 93 DX with 272,000 miles and was getting 380 miles to the tank! Help me please! I beg you! Anything to make my milage better!

b16a2 24 mpg...

1996 Honda Civic DX HB
Stock engine, exhaust, wheels (13")
CAI (custom)
5-spd manual
11.1 gallons US fuel tank
95% highway driving


I drive 140mi/day for 5 days out of the week, avaraging about 75mph. I normally get a hair over 40mpg, and usually drop about 8.2 gallons in the tank at the 300 mile marker- it gives me a hundred mile leeway. I run cheapie 87 octane from Flying J truck stop mostly.
Heh, one of the big things that will be a pain with an engine swap is my gas milage will get worse... i'm already at 2 tanks a week :/

oh well... I STILL spend less a week then those SUV drivers :biggrin:

Jesus, you guys to rag the hell out of your cars. i get about 385 miles per tank thats about like 33 mpg.
(stock 98 dx) :rofl:

holy dead thread batman!!! You drive a DX though, it the opitimy(sp) of gas conservation next to the HX and VX. I get about 250 miles out of a full tank in the Sentra, was the same in the Civic. But my ole' D16A6 really needed a freaking tuneup, just never got around to doing it.

Best I ever got on my d16y8 was like 320 on one tank....Lol but starting the motor when the tank is on "E" (very E) took some time...Kinda felt bad for doing that to her,but you gota do what ya gota do!

2000 civic dx with d16y7 w/ automatic tranny, just got 280 miles to the tank, but i only filled about 10.5 gallons so about 25-27 mpg, pretty damn goood when you look at all these non-four cylinder shits trying for 20...

Just got 443 miles on my last full tank on my 92 hatch dx and I get 280 miles on a tank with my 98 integra gsr. Both use 92 octane

98 civic d16y8, greddy evo exhaust, aem CAI w/ bypass valve, 11+/- gallon tank, usually fill up w/ about 9.5-10 gallons, and usually get about 225 miles per tank, which is usually between 25 and 28 mpg.

I get anywhere from 375-410 out of my 94 Civic DX. I have low rph shift points i could tell you since the damn car doesn't have a tach but i usually shift 1st at 15 2nd at 25 3rd at 35-40 4th at 50 and into 5th at 60. Now if i get a lead foot i still get 350 a tank.

D16z6 with fully built fuel system, ready for turbo but not in yet.
Intake and header but stock exaust.
I drive mostly freeway, 80/20 freeway /street.
I usualy get 220 miles to a full tank.

I just got 300 miles out of my 93 cx hatch d15b7, completely stock but with a completely filthy air filter. Damn thing probably hasn't been changed in half a year.

1996 Civic SR Coupe (D16Y8)

The best I managed was 350 miles, driving between 70 and 100 mph on a continuous journey. On average I get around 260 - 270 miles urban driving, with journeys usually around 5 miles. Surprising really because I don't really drive economically, I try to reach 5500 rpm at least once a day.

Petrol in the UK is expensive £3.70 ($6.50) per gallon!

Just got 443 miles on my last full tank on my 92 hatch dx and I get 280 miles on a tank with my 98 integra gsr. Both use 92 octane

woah! best i ever got to the tank was 310 tops. usually get 280. using 87 octane, enigne had 108k. any tips to get better mileage? or is it just my shitty driving? lol

OK!
This is interesting... I took the liberty of checking the stats of the thread so far and found the following for 11 gallon tanks, mostly at 50/50 city/hwy driving:

ROUGHLY:
33% of Civics do under 250 miles per tank (under23mpg)
33% of Civics do 250 to 300 miles per tank
(23-27mpg)
33% of Civics get 300+ miles per tank
(27+ mpg)

What does this mean??? Also, it seems many of the under 23mpg cars are EXs, mostly 95-99?

Under 100% city driving conditions, my stock 98 EX makes 20 mpg in very high Mexico City altitude. This might actually be normal....???

Cypress :(

woah! best i ever got to the tank was 310 tops. usually get 280. using 87 octane, enigne had 108k. any tips to get better mileage? or is it just my shitty driving? lol


For fairness I do sometimes cant get over 200 miles per tank in my civic if I drive aggressive or whenever its raining and start skidding on a empty parking lot which is very fun. Right now the civic has 280 miles and still has 1/8 tank left cause gas is too high so saving mileage.

good! glad im not the only one.

I used to knock down 27 mpg with spirited city driving and about 30 on the highway, now that I put a gsr motor in my car I have gotten 34 mpg on the highway, but I cant seem to keep my foot out of it during in town driving and am usually down around the 24 mpg range

haha.. this is all dandy... but how many of you actually fill your tanks up now or tend to drive less with gas prices going up..... here its like 2.89 for premium... but you know what.. when you got the need for speed and love driving then who cares about gas prices.. but then again... that just means less money for me to spend on my car.. especially when it costs $30 to filler up

Hello all, In my 2000 Civic DX (auto) iget 320per tank 10gallons.
I drive from tracy CA to Sanjose about 50 miles ea way. (87 octane)

In my 1988 CRX Si (manual) I get between 380-400 miles per tank.
CRX has 243,000miles on it! OG engine! No mods just a missing air filter at the moment. :2cents:

92' Civic Si.
Stock fuel tank
JDM F20B 11:1 Compression,
Skunk2 Stage 2 cams
hotshot header
CAI
Full interior
I usually get 300-325 miles to a tank.
Mixed driving, sometimes feeway, sometimes city
Sometimes it gets driven hard, other times gentle
But I use 325 as my drop dead mark.
I have to use premium, 91 octane. Usually Chevron.

i thought that the 93 octain wasnt good for smaller engine because it burned hotter. o well.
with my 98 civic Ex im only geting about 250 miles with 86 octain. i guess i must have a lead foot cuz i caint figure it out

i also regulatlry use 89just depends if i'm wanting to spend over $2.00 or not

Anything over 87 is a waste of money. All 93 octane does is make a tank of gas more expensive.

No matter how much work you do on your Civic, it's still a 4-banger and wishing on a star ain't gonna turn it into a Bugatti. At best, all high-octane does is cost extra and do nothing for you. At worst, over time it can actually harm your valves and piston heads.
It's good to see about half the people on here know that, at least.

i even heard it can burn so mhot that it will kill your cat and put holes in it

Kafziel, you need to read up buddy. Some people have to use 93 octane gas. My engine calls for premium. What does my engine get? PREMIUM! The reason for this is it has 10 to 1 compression. It doesnt matter if it has 4 cylinders or a thousand. If you have high compression high octane gas will help stop knock.


But yes, you don't really need it on a basic civic engine.

On Regular on a stock 96 Civic EX. I usually get around 180 miles on half tank (somewhere around 11 gallon tank). That's with A/C, I drive it average with 50/50 city/highway driving. So I get around 30 mpg on it. After I get done with the gas I currently have in my tank, I'm gonna put a full tank of premium in it for kicks.

OF COURSE some engines call for premium, but not stock Civic engines. This IS a Civic forum, is it not? And I think it's fair to say that most Civic drivers drive Civics with Civic engines. That's what makes them Civics. And 87 is the only gas to use.

I've heard filling premium in it once in a while does something, like remove carbon deposits, correct me if I'm wrong.

Once in a while is fine. Hitting your engine with a hammer once in a while is okay, too. Just don't do it every day. :)

92 Hatch dx with jdm d15b swap (vtec)short ram and full exhaust. well at first I had a vtec problem, that made it not engage... I was getting about 37 mpg in the city and 42 on interstate. then I fixed my vtec and now I'm getting between 32 and 29 in the city. interstate, dunno. vtec= gas drinker. lol jk but I do race my friends and random people that want to race. so I'm pretty hard on it.

94 ex 4dr, 5 spd

188,000 miles
no mods
35-39 mpg hwy
30 city
conservative driver

What engine do you have? 1.5

What kind of car? 94 Civic DX 5 speed

How much does you gas tank hold? 11.9
What kind of gas do you use? 87

Also if your particualr with what brand mention it to. Cheapest.

and most importantly do you do HIGHWAY or city driving? and how do you drive? Mostly highway and I drive 60-65, make sure I throw it in neutral going down all the hills. Another thing that helps with my fuel economy is I try not to use my brakes too much and let the car slow itself down. Less money spent on pads and it is less time your foot is on the gas pedal burning fuel. The jerky starts and stops kill your mileage and usually don't get you where you are going any faster because if this light didn't catch you the next one most likely will. I drive a truck for a living so some of my habits have carried over to my personal car.

my best per tank so far is 503, which i got 47mpg for that tank.

1.5l
1992 civic dx hatch(made in canada eh) 151,385 miles
brand- shell or kangaroo low or mid grade(honda recomends using low grade)



mods- aem cold air intake, tsudo headers, tsudo catback, front and rear upper tower strut bars, rear front and back strut bars, bosch o2 sensor, ngk laser cut sparkplugs, toucan short throw shifter. everything else is a stock part i had to replace in order to make it to work and back

best mpg. 47.8 (going through oklahoma and arkansas) best tank. 476 plus, highways are awesome and this is after i modded the engine

What engine do you have?
-- D15B7
What kind of mods do you have?
-- Intake (I know, ricer, but with a dual 16" air horns under the hood, something had to go.)
What kind of car?
-- 1992 Civic DX
How much does you gas tank hold?
-- 11
What kind of gas do you use?
-- 87
Also if your particualr with what brand mention it to.
-- Conoco and Phillips 66
HIGHWAY or city driving?
-- Both. I notice that I get about the same in the city and highway. The max I drive on the highway is 65, because the aftermarket cruise control only goes up to 65 and stops holding.
How do you drive?
-- Easy. The engine has 230,000 + miles on it. No need to race with it, that's what the F4i is for :)
-- I get 41.2 mpg. Sorry to hear everyone else gets a little over 30 mpg. At a full fill up (11 gallons) I get 453 miles to the tank.

Damnnnn this thread keeps on being revived. Nothing wrong with that I guess. This is so old! Aww when I posted on this thread, my civic only had 99,000 miles! Mine is at 131,000 right now. Still getting around 220-270 MPT on 87 octane. 90% city. I have a VERY VERY VERY Heavy foot and constantly rev and bounce my engine off of rev limiter. If I granny drive it one tank, I'm sure I could hit well over 300 now. Never once have yet though lol.

d15b7
150,000 miles
almost a ten gallon tank ( there's a dent)
320 miles per tank highway
280 elsewhere
i use BP 89
mods are intake, exhaust, plugs, wires, dist cap, custom cooling fan assembly and weight reduction.

Completely stock civic EX. I get 260 mostly city miles per 10 gallons, so about 26mpg in pretty much city driving, with some 2nd gear pulls here and there and being heavy on the throttle. I use 93 octane, mostly chevron and use Castrol Synthetic Blend, if that helps. Ohh and the car has 141000 miles on it.

i have a 93 civic with the d15b7 and i get about 250 per tank. its kinda bad gas mileage.

I have a short ram intake but I dont have a cat either. so maybe that has something to with it.

the weird part is that my distributor is turned all the way forward and my gas burns really really rich. but when i turn my rotor back, it like misfires and sputters when im in idle.

any suggestions?

Check your timing (Using a timing light)

Check your valve clearance.

Drive on with a hard on.

timing light? what is that? and how do i check valve clearence?

Better take your car in to a shop. Adjusting valves are easy, but even easier to f-up

please note that there are many factors affect bad in the gas millage just as :
-the short tranny
- the big rim
- wide tyre
-heavey weight
-high rbm
-your press hard at the fuel
-the opposite wind direction
-opening the sun roof
-bad tyre
-big engine
-the intake manafold ratio
-condition of the engine
-condition of the spark pluge
if something wrong please anyone tell me.

so if i took into the shop and said "oh im getting bad gas mileage, and my exhaust smells really rich" they will be able to figure it out?

i think its your distributor is

so if i took into the shop and said "oh im getting bad gas mileage, and my exhaust smells really rich" they will be able to figure it out?
Dude, If you have a wideband wired in you, then you are THE tuner. j/k
And no to your question, there are way too many factors effecting the fuel.
Injectors
Pump
Air Filter
ECU
recirculating system
pressure regulator
a lead foot :)

95 Civic LX, 5 speed manual, 173,000 miles

I just picked it up recently and so far the two tanks I measured I got 46.8 mpg and the most recent I got 41.9 mpg.

Oh yeah I fill up with 87 octane.

It's easy to calculate your gas milage. Just hit your trip-o-meter when you fill your tank, then the next time you fill up, devide the miles you've gone by the gallons the car took to refill.
I get between 40-45 mpg with my 95 civic hatchback 1.5 no mods, using 87 octane gas.
I'm about to put headers, a high-flow cat and short ram intake on it. I estimate I'll get up to or better than 50 mpg.
It really all depends on the way you drive. I throw her in neutral like half a mile before i know I'm gonna have to stop. I also shift right at around 2,200 rmp's. I really baby that car and I reap the benefits.
Oh and I rarely take the interstate. The 45 mpg is about 80 percent city miles. Rural city though. Long roads and big hills to coast down.

Short ram intake, headers, and a high-flow cat wont help your gas mileage. It will just make your gas mileage worse.

Short ram intake, headers, and a high-flow cat wont help your gas mileage. It will just make your gas mileage worse.

I second that statement. :grinyes:
Alex37211, please post your results when you complete your mods. You know those big hills that you use to coast, it takes more energy to go back up that same hill than what you gain going down.

Why wouldn't an intake and cat help? With the intake, more airflow = more power produced with the same amount of fuel right? More efficient. And the cat allows for the exhaust to flow more freely, preventing back-pressure and adding horsepower. These things are dyno-tested to add horsepower. There's no refuting that. And with more hp, the same car can attain the same speeds and cover the same distance as before, but with a little less effort (less gas spent). Correct me if I'm wrong.

More air requires more fuel. The chip in your car will force that to happen. That's where the 02 sensor comes in.

More air requires more fuel. The chip in your car will force that to happen. That's where the 02 sensor comes in.

How about cooler air? Wouldn't that help? And can't a high flow exhaust system increase efficiency?

You need back pressure. Hi flow cat won't help. It will probably let more fuel and air through your engine as along with the headers and intake.

Cold air is a lot more dense then warm air. So therefore to burn cold are you will need more fuel into the cold air.

More fuel = less gasmilage

On the money 01_Celica_GT.
That is why in the winter months you might feel your car have a little more power than in the summer. That is also why planes can carry more weight in the wintertime; air is thicker (more dense). You might also notice that your mpg goes down in the wintertime.
Basically everything that you think will help is the opposite. I doubt that you will get any more mpg out of your car. No matter what you add or remove, the chip will compensate for it to make the car run optimally (O2 sensor), usually by adding gas to the mixture. For a car that is over 10 years old and gets 40 mpg compared to hybrids today that get 45 to 50, I think Honda did an excellent job.

Thanks dude.

Yeah, Honda did do an awesome job, Now I just need to figure out whas wrong with my civic and figure out why it's getting such bad gas mileage.

I'm sorry if i'm being difficult. I understand what your saying, but I can't see the logic behind it just yet. I believed you untill I remembered K&N.

On K&N's website, they come right out and say that there air filters improve gas milage. It's a commonly known fact that their air filters are higher flow than a fram or wix or the other paper ones. There is also lots of testimony on their site claiming better gas milage AND a slight increase in power.

How can you guys explain this one? Do you refute K&N? Do think they're just making this up and fabricating testimony?

I have a K&N CAI. I have been tracking my gas milage for over 4 years and have had the CAI for about 2 years. I notice a little more hp on the upper rpm's, but otherwise, same mpg.

How about this. Do your own little test for yourself. Track you mpg for 6 fill ups to get a good average. Put in a CAI, track the mpg again. Add a hi flow cat, track the mpg again, etc. Come back and tell us your findings. Everyone that has responded has said that any upgrades will decrease your mpg. You are still trying to find other sources that say otherwise. Of course K&N will say 10% (or whatever they say) HP increase. No one would buy it if they say you lose 10% of your mpg and gain 1 HP. It is all about marketing. Read the fine print.

They also say that you could gain UP TO 15 HP. and you know that is probably not possible running on a stock engine.

Same thing, YOU COULD gain gasmileage, probably depending on your previous air filter. Probably cosidering it was clogged and dirty. There are a lot of variable s in the marketing aspect of car product, and any product.

Well i didnt read thorugh all ten pages, but i hit the E at 400 miles, which equates to 9.6 gallons. That my friends, is 41.6 MPG. stock d15 in my 93.

buuuuuuuut. I also use about a quart of oil every tank too :D

9.6 gallon tank? I thought all civic's had an 11.9 gallon tank?

My tank is either 10 or a little shy of it...And it's a CX. So maybe it's true. I usually get like 25-28 mpg. I just replaced the O2 sensor, so I may see an increase.
Mods are: JDM b20b, ls transmission which is basically dead, full MSD (6AL box, SS coil, dizzy cap & rotor, and wires), No name intake, LS intake manifold, Iridium plugs, Del Sol 14's, and a completely gutted car thanks to some thieves who left my car someplace where the police could find it...oh, and I pump 87 or 89 i don't need 93 yet.

Every time I read this thread I'm disgusted at the lack of knowledge of the poster. Calling 87 sick. If you're engine is designed for 87 then that's what you're supposed to run. Octane doesn't mean quality.

1993 cx 48-53mpg
1993 dx (coupe) 45-49mpg
1994 Mustang GT 22-26mpg

I do better with 93 than 87. I try to stay away from gas with ethonol in it, most gas has up to 10% ethonol and that brings down my mpg. I think Shell, BP, Citgo and Amoco all have "pure" gas with very few if any additives. I use 0w30 synthetic oil and that helps also.

93 Civic EX

37-40mpg on 87oct
I also have 220,000 miles on it.
I drive 115 miles a day over a mountain and semi-flat roads and usually cruise about 70mph.

Car: 1995 LSI Coupe. Absolutely stock, except 215 17 40s at rear, 205 17 45 at front. 193,000 miles.

Consumption: depends hugely on road and weather conditions. Anything from 270 to 375 on a full tank recorded lately . . .all Premium unleaded (currently 0.99 GBP per litre! )

Mileage:1100 miles per week (South East England to Central Scotland at avg 100 mph early hours of Monday morning, return trip Friday afternoon at avg 65 mph, 10 miles town per day at 20 mph to 40 mph.

Hi guys. I drive a 1992 civic ferio, D15B VTEC-E engine. I get 530 miles from a tank(4.6l/100k) . Thats having run on the low fuel light for maybe 20 miles. I use 95 octane. 80% highway driving.
Mods include Warm air intake, grille block, tires up to 44 psi. Tires are 185/65/14. I keep to 80 or 90 kph. Speed limits are 120 but i'm in no rush! I drive 25000km per year and save 600 euro on fuel.

1995 DX HB gets about 42 on hwy and 30-32 in town.
It will burn any cheap gas I can find just fine.

When i had my 94 civic sedan....

D15B7, only mod was a backyard DIY intake w/ 3" ABS plastic tube running from TB to stock airbox w/ K + N filter and silencer delete.

Stock suspension, stock wheels, stock everything.

630 km to the tank, roughly 393 miles per tank. Oh yea, and i use the cheapest dirt 87 octane. =]

PS: 5 speed tranny, 1st gear goes to 60 kmh, 2nd to 100kmh, 3rd to 140kmh, never topped 4th, maybe around 180? Just so you can figure out gear ratios if you really wanted to....i just think it was a stock LX tranny, if it wasnt swapped....

I had a '98 Civic EX that got about 35 city and 40 highway. I thought when I bought an '06 Civic EX, I would get about the same. I was SO wrong. I have twice gotten 24mpg. & that was when I drove 200 miles highway. I took it in the Honda dealer and they said that they did a fuel diagnostic and everything is fine. The other local Honda dealer won't even look at it; said it would be a waste of time. I was told by a shop that specializes in Hondas/Acuras and they told me to try the super premium gas and see what happened. Well, I tried this with 2 consecutive tanks and my mileage was about 22mpg. I am not a speed demon in any way, especially now that I have a toddler riding with me. Can anyone give me some advice?

Thanks:o)

I had a '98 Civic EX that got about 35 city and 40 highway. I thought when I bought an '06 Civic EX, I would get about the same. I was SO wrong. I have twice gotten 24mpg. & that was when I drove 200 miles highway. I took it in the Honda dealer and they said that they did a fuel diagnostic and everything is fine. The other local Honda dealer won't even look at it; said it would be a waste of time. I was told by a shop that specializes in Hondas/Acuras and they told me to try the super premium gas and see what happened. Well, I tried this with 2 consecutive tanks and my mileage was about 22mpg. I am not a speed demon in any way, especially now that I have a toddler riding with me. Can anyone give me some advice?

Thanks:o)

From what people around here tell me, none of the later models over 2000 or so, are not as good as the 90's hondas.
They can't believe that I get 33-35 to work and back. Most say they get 22-25 around town.
I have a 93 hatch with LS B18B1 and it gets about 26 and the 95 hatch DX gets 33-35 to work. That's great for me.
And I burn the cheapest stuff I can find in both cars.
A woman I work with owns a 2006 Accord and she only gets 26 on the highway.

What engine do you have? i have a b18c1
What kind of mods do you have? aem short ram intake, cat delete, 2 1/4 piping, ebay muffler, nitto neo gen tires, ngk plugs and wires, custom chipped ecu
What kind of car?93 civic si hatch
How much does you gas tank hold?ugh 12 gallon i think, idk
What kind of gas do you use? 91 cause cali sucks
Also if your particualr with what brand mention it to. chevron
and most importantly do you do HIGHWAY or city driving? and how do you drive?

i do city and highway everyday. usually, kinda hard i get between 300 -375 a tank, i fill up when the needle hits the red. before the light comes on

holy balls this thread is old