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post #1 of 6 (permalink) Old 04-05-2012, 05:47 PM Thread Starter
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Anyone Help Me Out with Mileage?

i think my cobalt is getting bad gas mileage its only getting about 300 miles a tank for some reason i have 18 inch wheels on it but i still feel like im not getting what i should be in this little car..was kinda expecting at least 400 a tank...so any ideas on how to up it or why its not getting better?
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post #2 of 6 (permalink) Old 04-05-2012, 11:00 PM
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Are the new tires the same O.D. as the old ones it could be the tires are bigger and you are really going farther than the car says.
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post #3 of 6 (permalink) Old 04-06-2012, 03:41 AM
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If it makes it any better, you're not alone. Lots of folks here report low fuel economy. In your case I don't think the oversized wheels are helping but my sense of it is most of it has to do with how you drive. In their OEM configuration, these cars can generally get between 35 - 40 mpg in normal suburban traffic conditions without too much effort on the part of the driver. They're a pretty good hedge on higher gas prices.

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post #4 of 6 (permalink) Old 04-06-2012, 08:52 PM Thread Starter
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yea i opted for a slightly bigger tire 225/40/18 and the recomended was 215/35 but i think the 10 millimeters wider wont do anything in terms of making it that much worse and i got a 40 series because it woould protect the wheels a little better...i only have 47000 miles and there is nothing noticiably wrong(wierd noises vibrations etc)
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post #5 of 6 (permalink) Old 04-06-2012, 09:59 PM
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You realize that that is 5% bigger than recommended. So if you think your only getting 40mpg your actually getting 42mpg.

---------- Post added at 12:59 AM ---------- Previous post was at 12:56 AM ----------

What was your OEM tire size?

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post #6 of 6 (permalink) Old 09-20-2012, 07:37 AM
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Im not sure you're getting "bad" gas mileage per say, i average between 300-350 per tank. i do a mix of city and highway driving, thats also a good factor to consider, as well as how you drive your car (i.e heavy on the gas etc.)
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