18 Mpg?! What the Heck?! - Page 2 - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #11 of 15 (permalink) Old 06-27-2014, 11:40 PM
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have been noticing the same, my gas mileage has sucked even after changing the spark plugs and air filter. s the fuel filter in the gas tank? have a 2008 Cobalt sedan 4 cyclinder.
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post #12 of 15 (permalink) Old 06-28-2014, 02:52 AM
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running 30 mpg currently.

2010 Cobalt LT K&N TYPHOON INTAKE
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post #13 of 15 (permalink) Old 10-14-2014, 12:44 PM
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I have an aftermarket intake and iridium plugs on my 06 SS/SC

Im averaging 8.7L/100km which equates to roughly 27/28mpg...

Not bad for forced induction and a 5-speed! (driving like a grandpa most of the time helps, lol.)
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post #14 of 15 (permalink) Old 10-14-2014, 06:50 PM
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I'm getting 38 mpg average, doing the math the old fashion way at each fill up, though my DIC says 34. on another note, I live between Milwaukee and Green Bay in Wisconsin, drive to Rockford Illinois twice a month to visit my daughter, always fill up down there, not to mention it is .20 gallon cheaper, but my car runs better it seems on that gas as well! All fuel pumps here say 10% ethanol, no mention on Illinois pumps....they have ethanol?

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post #15 of 15 (permalink) Old 11-07-2014, 05:28 PM
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Quote:
Originally Posted by Thogan3 View Post
I'm getting 38 mpg average, doing the math the old fashion way at each fill up, though my DIC says 34. on another note, I live between Milwaukee and Green Bay in Wisconsin, drive to Rockford Illinois twice a month to visit my daughter, always fill up down there, not to mention it is .20 gallon cheaper, but my car runs better it seems on that gas as well! All fuel pumps here say 10% ethanol, no mention on Illinois pumps....they have ethanol?
Envious of that mileage! haha I'm about to replace the spark plugs and see what mine can do afterwords. Already replaced the fuel filter, air filter, sea foamed it, among other maintenance tasks. I'm running around 26 on average with me peaking at about 30-31 on the highway over distance.
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