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Chevrolet Cobalt Real World MPG

295 messages,  Last post on Nov 23, 2009 at 4:23 PM

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What is this discussion about? Chevrolet Cobalt, Fuel Efficiency (MPG), Coupe, Sedan


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#61 of 295
Re: Computer readout [grosloup] by jaxs1
Aug 12, 2007 (10:19 am)
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Replying to: grosloup (Aug 12, 2007 9:19 am)

You are damaging your car by overfilling it trying to get the gas to come up into the filler neck. There is empty air space for a reason.
Just stop it at the first click and average the mpg over 3 fillups.
#62 of 295
Re: Computer readout [jaxs1] by grosloup
Aug 12, 2007 (11:33 am)
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Replying to: jaxs1 (Aug 12, 2007 10:19 am)

Never thought about that air space.
You're right,there must be a reason for that. From now on stopping at the first click and using your method.
Thanks for the advice.
#63 of 295
knowing the distance by okko1
Aug 12, 2007 (4:12 pm)
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i drive nearly the same distance every day it takes about 8 to 9 gallons a week and the average always seems to be with in 1 mile of the mpg of the computer. though this can be differnt depending how hard i drive the car.
#64 of 295
Re: knowing the distance [okko1] by cmhj2000
Aug 12, 2007 (4:14 pm)
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Replying to: okko1 (Aug 12, 2007 4:12 pm)

"though this can be differnt depending how hard i drive the car."
 
I find this interesting. Something for this ole' fart to ponder on.
#65 of 295
Re: Computer readout [grosloup] by prdm
Aug 14, 2007 (6:42 am)
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Replying to: grosloup (Aug 12, 2007 11:33 am)

Over filling will shunt liquid gas into the vapor canister which is designed to hold, wait for it, vapor. It's possible to destroy the canister this way but I think that would trigger a CEL. If you have been doing this alot get the cannister checked - it's simple.
#66 of 295
Re: Computer readout [prdm] by poncho167
Aug 14, 2007 (9:23 am)
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Replying to: prdm (Aug 14, 2007 6:42 am)

Also, as pointed out on the nightly news, it is bad for the environment for those fumes to escape into the atmospher.
#67 of 295
Any ideas on loss of gas mileage? by tarco
Aug 16, 2007 (9:01 am)
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My Cobalt was averaging 29 mpg when it suddenly dropped to 16-17! Took it to the dealer expecting a fuel leak, but they couldn't find anything. Any ideas on what the problem could be?
#68 of 295
Re: Any ideas on loss of gas mileage? [tarco] by grosloup
Aug 16, 2007 (2:35 pm)
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Replying to: tarco (Aug 16, 2007 9:01 am)

Is that 29 mpg average coming from a reading of your computer or is it a real mpg test?
Going from 29 mpg down to 16-17 is a pretty big difference.
#69 of 295
Re: Any ideas on loss of gas mileage? [grosloup] by tarco
Aug 17, 2007 (3:32 am)
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Replying to: grosloup (Aug 16, 2007 2:35 pm)

Both. The computer reading went down, and now we are in the process of documenting it with fillup receipts, mileage log, and photos of the odometer. Very strange!
#70 of 295
Re: Any ideas on loss of gas mileage? [tarco] by poncho167
Aug 17, 2007 (4:54 am)
Reply

Replying to: tarco (Aug 16, 2007 9:01 am)

I have heard of some cars brake pads/shoes sticking causing a drag on the brakes and lowering mileage, but I don't think it was near that much.

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