Gas Mileage

[blueburbboober]

wow, you guys must have lead feet. when mine isnt in the shop NOT getting fixed by incompetent dealers, i average 25 mpg in everyday driving. Road trips (as in driving 4-16 hours) i average 34-36 mpg. mileage is all in how you drive it!

[ParkAvenueOwner]

I'm surprised to hear that some of you get such shitty mileage. 16mpg sucks ass, especially for an Impala. My 2000 Impala 3.4 with 70k miles on it gets 32 highway and 22-24 city. I'm only a 16 year old driver and I'm not exactly slow. The only explainations that I can think of for such bad mileage are either a poorly maintained car, or bad driving habits.

[crazy Jim]

my '02 gets 22-25 mixed. 16 MPG may be indicative of a failing/plugged catalytic converter, very low air pressure in the tires or numerous other issues resulting from a poorly maintanied vehicle.

[benztech82]

Hi everyone. I'm just now starting to post on here although I've been using this site for repairs for almost a year now. Just thought I would let you know that my 2000 Impala LS 3.8 is getting a steady 29.5 MPG during summer months and about 27 during the winter months. I drive 110 miles round trip per day to work and back. I reset my trip odometer every time. Thats the only tool I have since my fuel gauge is extremely inaccurate (like no one else has seen that).

[novajoe]

I just traded my '04 Impala LS with the 3800 (it was leased, big mistake), and I was getting an average of about 22 to 25 all the time. I drive about 75 to 80 most of the time on the xway, and about half my time is spent on there. I had 45k on it when I traded it, and I kept mileage since it was new. One guess for your poor mileage might be the ac compressor might be dragging. That could be the reason for the ac not getting cold too. Have that checked out first.

[Lenta]

I have Impala -01, with 78 k on it on 3.8 engine. I drive mostly in the city. So, it is usually makes 19-22 in the city and 25 afre that to 29 on highway, if you are on long time trip ( driving more than 2 hours on highway).I never had more that 30 mi per gallon.
So, if we say that 01 has 20- to 30, so my -01 after 6 years shows ok mileage. Or not?

[crazy Jim]

'99 Grand Am 3.4L 140K miles city/hwy= 25+ mpg weird thing is lately it seems to be getting even better....

[Lenta]

What do you mean 2com[pressor dragging? By the way, ac compresor a kind of little bit was dragging, I heard that. But what do you mean how it impacts on the milage? ac also doesn't work good. by the waqy; not enough the cold. Or slow warm air comes and cold also slow.
Can you explain how ac compresor works for loq milage oof DRAGGING? Thanks.

[SpinnerCee]

The AC compressor is a belt driven pump -- it takes horsepower ro run it -- when you have it on, your engine has less power, so it needs more fuel to do everything it does -- driving with the AC on has the effect of adding (significant) weight -- you should be able to feel the loss in power, and the engine PCM may also raise the engine idle speed and turn electric fans on high speed (=more fuel consumption) to compensate as well.

The AC compressor has a clutch that activates it only when you turn on the AC modes -- that way it doesn't always rob performance.

The alternator/generator is also belt driven, and its parasitic drag on the engine also increases as the electrical load increases -- so amps, subs, fans, AC, DVD players, LCDs, neon lights, HIDs , etc.. increase electrical load and decrease both performance and mileage when they are operating.

[1967chevelleSS]

my brother had an 03 impala and he was getting 26 miles to the gallon with like 96000 miles...i forgot which engine he had though

[BNaylor]

Sorry but this poll and thread has been closed.