Such good gas mileage?????

[mvaughan]

'04 Denali with 6.0L and 3.73 @ 8000 miles is now getting 13/17 city/highway - not great, but if you can afford a $55K vehicle then who cares about gas mileage?

[sunbeam7011]

Originally Posted by mvaughan

'04 Denali with 6.0L and 3.73 @ 8000 miles is now getting 13/17 city/highway - not great, but if you can afford a $55K vehicle then who cares about gas mileage?

...thats right. That is great milage I might add for a 6.0 liter. There are many mid-size and compact so called SUV's that get that milage too; with a 4 or 6 cylinder!

[2kflhr]

I had a '92 2dr. 4X4 Yukon that averaged 16-17 mpg city/hgwy, now I have a '99 4dr. 4X4 Yukon that averages 15-16 mpg city/hgwy.

[tjworthen]

I recently bought a 99 4x4 Yukon with a 5.7L.
I just filled it up today and got 14.4 mpg average for the tank.
This is in Utah and I drive between 4500' and 7000' regularly.

[tron1989]

I have gotten as much 19.5 mpg in my Yukon averaging 75 mph, Syn oil and A K&N filter, stock exhaust. But constantly 17 -18 mph hwy.

[tonytone]

Originally Posted by tron1989

I have gotten as much 19.5 mpg in my Yukon averaging 75 mph, Syn oil and A K&N filter, stock exhaust. But constantly 17 -18 mph hwy.

Is your Yukon the 5.3L or the 4.8L? You didn't mention which Yukon you have, but I'll guess you have the shorty since you didn't mention XL--IIRC the shorty only comes with the 4.8L (except the shorty Denali, which comes with the 6.0L), whereas the XL comes with the 5.3L or 6.0L (Denali only). If you have the shorty w/ the 4.8L, then 19.5 mpg is pretty good but not really extraordinary, given the engine. OTOH--if you have the 5.3L (or the 5.7L--dunno if you have the OBS or NBS Yukon), then 19.5 is a really good figure!

[dclive1978]

i have an 01 yukon slt with the 5.3 that used to get great mileage. i was consistently up around 18.5-19 mpg for the first few months that i had it. since then it's begun to dip to the point where i am now lucky to get over 17.5 and usually end up in the mid/upper 16 mpg range. i've had the car for just over a year now and i've lose almost 3 mpg during that time. i don't get it. my driving habits are the same as before (mostly highway miles, about 5000 per month - use it for work, keep it at about 80 on the interstate).

i recently replaced the fuel filter and plugs to see if that would have any effect, and while it cleared up the little bit of engine knock i was picking up, it didn't improve mileage one bit. does anyone know what might have caused the sudden drop in mileage?

[JackBauer]

My 03 Yukon Denali at first was getting like 14 mpg, now since I change the oil, and and use the cruise control a lot I get 16. Plus I am easy on the brakes a lot of women drive them for whatever reason, and they slam on the brakes constantly and that will give you low miliage too. Go with your standard Yukon Denali, it's big enough and easier to park. I haven't had a single issue with my Denali knock on wood.

[Duramax Dually]

Our Denali is a whopping 13.6 all the time. I did a comfirmation manually. Will be unloading soon. Very dissatisfied over all. (other problems with stuff and bad gas mileage) Lose /Lose for $50K

[tonytone]

Originally Posted by dclive1978

(...keep it at about 80 on the interstate).

Well that's your problem right there--you definitely won't get decent fuel economy out of a Denali at those speeds. Based on personal observation, I find the "sweet" spot as far as getting good fuel economy at cruising speeds to be between 65-70 mph.

FWIW--I get around 14 mpg with a 70-30 city/hwy driving mix, 15 with a 50/50 mix, and 16 with a 30/70 mix. I recently averaged 17 mpg on a full tank of gas during a recent trip to Oregon...fairly impressive IMHO, considering that I was driving a DXL loaded with 4 other passengers and a fully-loaded rear cargo area.

[dclive1978]

Originally Posted by tonytone

Well that's your problem right there--you definitely won't get decent fuel economy out of a Denali at those speeds. Based on personal observation, I find the "sweet" spot as far as getting good fuel economy at cruising speeds to be between 65-70 mph.

FWIW--I get around 14 mpg with a 70-30 city/hwy driving mix, 15 with a 50/50 mix, and 16 with a 30/70 mix. I recently averaged 17 mpg on a full tank of gas during a recent trip to Oregon...fairly impressive IMHO, considering that I was driving a DXL loaded with 4 other passengers and a fully-loaded rear cargo area.

normally, i would agree with you, but since i was driving the same speeds and routes several months ago when i was averaging close to 19 mpg it doesn't make sense that i'd lose 2 mpg over a pretty short amount of time. it's not like i changed my driving habits in the last couple of months. everything is the same except gas mileage.

[the blur]

my Denali gets 11 towing my open bed race car trailer... and about 8.5 towing my enclosed 3000 trailer.

[ukaussi]

Originally Posted by Eggert

Hi UK Aussie, 9 mpg may be the lower end of the 'acceptable' range, I get 10. What do you get on the highway?
Do you have the 3.73 or 4.10 rear end?
Does anyone have the mpg numbers for the 8.1 liter (496 CID) engine?
I expect 9 mpg around town and not much more on the highway, towing probably around 6 to 8, depending on the hills.
Take care, Eggert

Not sure what it does but ave info on trip computer said 12mpg when I reset it before a fwy trip and read it at end of trip

[tonytone]

Originally Posted by dclive1978

normally, i would agree with you, but since i was driving the same speeds and routes several months ago when i was averaging close to 19 mpg it doesn't make sense that i'd lose 2 mpg over a pretty short amount of time. it's not like i changed my driving habits in the last couple of months. everything is the same except gas mileage.

Notwithstanding the possibility that there may indeed be something wrong w/ your vehicle, I would like to ask you this--do you live in a state where they switch from summer gas to winter gas during the cold season? If so, then that might fall in line w/ your statement that fuel economy seemed to be okay "several months ago"...although to be honest w/ you, I can't say whether gas formulation could result in a 2-mpg loss. 1-mpg, maybe...I can only assume you've checked the trivial possibilities, e.g., tire pressure, etc.--no?

[Dave Carpenter]

My 1975 GMC 4x4 pick-up gets 12 -13 mpg. My 2003 Yukon is getting about 15-16 mpg. This is calculating them the old way (with a pencil). 30 years difference between them. The 75' has about 500,000 miles on the drive train. In 1999 I put a stock 350cu.in. Goodwrench crate motor in it. It's getting the same mpg as my original motor. Do they mean to tell me, that in 30 years time, with todays technology, only 3 mpg more can be achieved in the computer laden Yukon. That's 1 mpg per decade. Is that obscene? No, that's big business. That's big oil. I was watching the news in Feburary, and they were showing a segment of a CEO or COO speaking to an annual conference of oil industry execs, which, to have let news cameras inside is not just rare, but it's never been allowed before according to the news broadcaster. This CEO was saying how they (the oil companies) have made so much profit over the last year and a half, and that it's so absolutely astounding even to themselves, that he hopes they haven't shot themselves in the foot by letting news crews in. Have you ever noticed that when someone invents or designs a car or component that gets super gas mileage, that you never here about it any more. Like the 2 junkyard guys who tweeked a Capri and got 80 mpg driving coast to coast. OH WELL!