8.7 Mpg Average? - 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 38 (permalink) Old 07-14-2012, 07:40 PM Thread Starter
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Unhappy 8.7 Mpg Average?

I've been going through just about all of the mpg threads and even started searching for posts by Fr3AkAzOiD but still can't make much sense and i'm thinking of just bringing my balt into chevy to get them to take a look.

For those who don't know i have an 09 Cobalt sedan lt, i live in Washington right now so i know the hills and all aren't helping me at all but i don't floor it, coast as much as i can, alway try to keep my rpms under 3k, a/c off as much as possible (just got tint tho so will need it for the next few days), and also have my tires up to about 35 to 37 psi depending on how hot or cold it is during the day. But the dic is still telling me at max i've gotten 10 mpg, and when i fill up it tells me i only have 226 miles i can go, i know that its better to do the math myself and have and its about right give or take a few miles and i would imagine if it was running that bad then it would sound like **** but it doesn't.

I did have to unplug my battery to install my new speakers a few days ago but i would think the computer would have relearned by now. Any ideas even if its where to start looking before i bring it in?
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post #2 of 38 (permalink) Old 07-14-2012, 07:50 PM
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Reset one of your trip odometers at next fill-up and you should be able to go 350 miles before next fill-up. If your not even close I would definitely bring it in. Or somebody is stealing your gas.

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post #3 of 38 (permalink) Old 07-14-2012, 07:53 PM
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I only get around 300. Mine messed up:/
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post #4 of 38 (permalink) Old 07-14-2012, 07:57 PM Thread Starter
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hahaha i did that and waited to half a tank and i had gone 66 miles last time, and it's kinda hard for someone to steal my gas without the gas key lol
I was noticing this when i would have to sit in my car waiting to get released from work since there wasn't anymore to do but had the ac on just sitting there for an hour and was going to post but opened the doors and left it off and still am getting the same thing another half tank later. the speed limits here are mostly 35 with 40 tops on some streets. And i drive like 80% city 20% highway.
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post #5 of 38 (permalink) Old 07-14-2012, 08:05 PM
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Check what your average speed is if it's less than 20mph your mpg won't be high for sure. Maybe you should take it out on the highway for 50miles just to see. Reset your dic once at 60 mph and see what it does. It should be around 28mpg @ least.

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post #6 of 38 (permalink) Old 07-14-2012, 08:14 PM
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Yea use the trip meter I use mine and I get 245-267 out of a tank my gas never goes below the last notch before empty you should be getting at least 320 see if that works

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post #7 of 38 (permalink) Old 07-14-2012, 08:16 PM Thread Starter
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Alright well I'm going to do a run to the gas station which is about 2 to 3 miles away and post some readouts from this usb odb reader that can log data while I drive and I'll post when I get back see if it helps any
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post #8 of 38 (permalink) Old 07-14-2012, 08:33 PM
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So why am I getting around 300:( I baby it!
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post #9 of 38 (permalink) Old 07-14-2012, 09:37 PM Thread Starter
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alright here are the pics of the data from my computer that i thought might be helpful from my trip
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post #10 of 38 (permalink) Old 07-15-2012, 06:55 AM
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Looks like you spend a lot of time idling. All sensors seem to be in acceptable range. That all looks normal for a short run in town. Lucky you don't drive a Hummer. Driving habits have a lot to do with fuel economy. I mean if you stop to talk to a friend for 15 minutes and don't turn your engine off, it's going to be represented in your mpg. If you don't anticipate traffic lights and are always hard on the brakes, it's going to manifest itself in your mpg. If you always have to be first at the red light, you can be sure you'll never get great mpg. Avoid drive-through's

Every minute spent angry is a happy minute lost for ever and ever!!!
Drives 2016 Cocoa Buick Encore 1.4L Turbo auto KL4CJDSB2GB652675
Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

Never drive faster than your guardian angel can fly

Last edited by Coby7; 07-15-2012 at 06:59 AM.
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