Getting Better Gas Mileage - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
All about MPG All about maximizing your Miles Per Gallon (MPG)

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post #1 of 30 (permalink) Old 10-21-2011, 08:19 AM Thread Starter
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Getting Better Gas Mileage

I have a 2005 cobalt. I bought it used in 2008 and was getting an average of 33 mpg. Now I am getting between 22 and 26. I reset my average mpg every time I fill up. I drive mostly highway and occasional city. My car has about 112,000 on it and I changed the spark plugs about 12,000 miles ago and it didn't raise the mpgs at all like I heard it would. Any tips on raising gas mileage?



Cobalt 2.2L LT, tinted tail lights, 18" Tenzo Type M wheels, black halo headlights, 8k hids, Kenwood hu and 12" JL audio 12w0
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post #2 of 30 (permalink) Old 10-21-2011, 10:21 AM
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Buy a Nissan Leaf............
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post #3 of 30 (permalink) Old 10-21-2011, 11:17 AM
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Maybe your air filter is dirty, or you are buying gas with ethanol without knowing.
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post #4 of 30 (permalink) Old 10-21-2011, 06:41 PM
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air filter would be my first stop too.
any codes? is it acting funny in any other way? how does the oil look at change time? you got a fair amount of miles, could be a lot of things. or a combination of them.

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post #5 of 30 (permalink) Old 10-22-2011, 10:24 AM
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Gas mileage always gets worse with colder weather.
Even with my hypermiling I've lost about 5 or 6 mpg vs what I was getting two months ago.

If that isn't it then I'll agree with others that the air filter is a good place to start but you may also want to get your alignment checked.
Most places will offer a free check of your alignment and I know I gained 2 mpg when I had mine corrected last year.

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post #6 of 30 (permalink) Old 10-29-2011, 05:43 PM Thread Starter
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I changed my air filter last year. I just checked my oil the other day and it is just slightly dirty, but it also needs changed.



Cobalt 2.2L LT, tinted tail lights, 18" Tenzo Type M wheels, black halo headlights, 8k hids, Kenwood hu and 12" JL audio 12w0
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post #7 of 30 (permalink) Old 10-29-2011, 06:30 PM
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buy a 2.25 or 2.5 exhaust system, check air filter or buy an aftermarket intake, and i think aftermarker headers might help too. this is a way when you have money and dont want to go cheap. idk. id do this if i had the money. but if you just want to go the cheaper way, check air filter

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post #8 of 30 (permalink) Old 10-31-2011, 08:49 PM
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Why do so many people tell others to waste their money on aftermarket crap to improve fuel efficiency?

If you want more HP thats one thing but the stock setup (2dr, 5sp manual) is capable of running 40+ mpg averages for the year with the right driving habits.
Minor tweaks (partial grill block, reduced toe alignment, 40 psi in tires) and staying off of highways has me averaging over 50 mpg for this year.

Yet every time I turn around I'm hearing the tuner crowd saying to spend several hundred to change this or that.

The only thing that needs to be changed is the behavior of the "nut" behind the wheel.

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post #9 of 30 (permalink) Old 12-15-2011, 02:33 PM
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I got 23mpg in my LT and I get 22mpg with my SS. Even with clean filters and new plugs.. I guess the mountains kill my mpg
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post #10 of 30 (permalink) Old 12-20-2011, 03:42 AM
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I'm getting around 5 MPG less now than in summer. I attribute it to the cold weather and school traffic. I got as high as 41 MPG last summer and now I'm getting between 35 and 36.

Driving style is probably the biggest thing you can do to increase mileage. If you think about it, using your brakes wastes energy as is using the low gears to get the car back up to driving speed. So don't tailgate, look ahead and try to time the lights when you drive. Also fill up your tires. I try to keep mine around 38-39 lbs (warm).

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