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post #1 of 27 (permalink) Old 02-06-2014, 09:22 PM Thread Starter
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MPG Problem HELP

i just bought a 2009 chevy cobalt sdn, auto with 45K miles from the dealer. i noticed i get about 200 miles to a full tank, at least half of that was highway miles. I dont know why this is, oil just changed and air filter changed, wheels are aligned. I read on a forum where this guy said he had the same problem with his, so he took his car somewhere and got a "trifecta" tune that took him from 200 a tank to 360 a tank. is that what i need to do, if so, where would i go for that and if i did tune it to get better mpg, would it void extended warranty i got with the car? i got a 60 month/60,000 mile warranty with it. any advice would be greatly appreciated! Thanks for looking.

Also, what is recommended tire pressure for this car? and im reading forums with people getting like 40 to 50 mpg with their 09 cobalts!, something wrong with mine, should i take it in???

Last edited by Deven534; 02-06-2014 at 09:29 PM.
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post #2 of 27 (permalink) Old 02-07-2014, 02:13 AM
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I think 40 to 50 is kinda out there, if you drove nothing but highway you could get 30+ if you kept it between 55 and 65. It's almost impossible here because of the traffic we get on the highway.

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post #3 of 27 (permalink) Old 02-07-2014, 03:22 AM
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I get in the 50's on the hwy doing 55-60mph but I also live in canada. There was a guy on here from the states that said he saw 46mpg one time but he was fully bolted and tuned. The automatics always get worse fuel mileage it seems. My average in summer is 7.2L/100km, while the best I've ever seen on an automatic is high 8's to low 9's

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post #4 of 27 (permalink) Old 02-07-2014, 04:39 AM
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I get 34-37 mpg during summer and like 23 during winter.. I don't drive slow though

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post #5 of 27 (permalink) Old 02-07-2014, 05:26 AM
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Deven534 the best way to check if you have a problem or just bad driving habits is to take it on the highway, bring it to speed (60mph) keep it there reset your mpg on DIC. After about 5 minutes you should have your highway average. My 07 auto gets 6.7l/100Kms. (35mpg US) in the summer. If you get anything close to 30mpg this time of the year there is nothing wrong with your car.

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post #6 of 27 (permalink) Old 02-07-2014, 05:33 AM
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Also a bad habit I do during winter is let my car warm up..that kills mpg

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post #7 of 27 (permalink) Old 02-07-2014, 07:53 AM Thread Starter
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Ok I will take it on the highway and try that. But is there any commom issues with these cobalt that I have to be aware or that would affect mpg??
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post #8 of 27 (permalink) Old 02-07-2014, 07:54 AM
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When I changed my fuel filter I saw night and day. My mpg when from being stuck at 24.2 (no matter what-tune up, tires, etc) and jumped to 32.7 on the hwy. I have pics to prove it.
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post #9 of 27 (permalink) Old 02-07-2014, 08:22 AM
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Originally Posted by Deven534 View Post
Ok I will take it on the highway and try that. But is there any commom issues with these cobalt that I have to be aware or that would affect mpg??
Could have a fuel leak.. do you smell gas or see any drips? That's fairly common but probably not the cause here. Are the spark plugs good and gapped properly?

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Last edited by Coby7; 02-07-2014 at 08:56 AM.
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post #10 of 27 (permalink) Old 02-07-2014, 08:37 AM
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you can tell without question when there is a fuel leak. Happened to me, reeked like fuel at stop and moving. Took it to the stealership- got the Special Coverage or whatever for a cracked fuel pump resevoir. But the OP would know if thats the problem
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