First 50+ MPG on '08 Cobalt XFE - Fuelly Forums

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Old 06-05-2009, 06:09 AM   #1
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First 50+ MPG on '08 Cobalt XFE

I finaly did it and broke the 50 mpg barrier (51 mpg to be precise).

All driving was done on my 75 mile round trip to and from work and fillups were done at the same gas pump.

My in car mpg reader actualy said I did 51.5 but it's usualy off by +/- 1mpg.

The ends I had to go to to get it were a bit extreme (45 in a 55 mph limit) so it wouldn't be a regular accurance but it's getting me more interested in doing some aero mods to hopefully help get my tanks up to the mid to upper 40's on average.

Wife is going to Disney this weekend so maybe I'll have the chance to work on some aero mods.

Other then running the stock tires at sidewall max +/- 1 psi the car is a completly stock 2008 Chevy Cobalt XFE with 22,000 miles on it.
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Old 06-05-2009, 11:47 AM   #2
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Try one of these, shop around though. I have one and love it.

http://cgi.ebay.com/Extra-Wide-PANOR...3286.m20.l1116
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Old 06-05-2009, 12:29 PM   #3
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"OEM tires are Goodyear Integrity P195/65R15 with a rolling resistance of 0.00955 "


Thats great. 50 + MPG is very impressive.

Where did you find the rolling resistance of your tires ?
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Old 06-05-2009, 02:09 PM   #4
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I found a spreadsheet online with the rolling resistance for quite a few tires, I'm at work now but will post the link when I get home.

Thats for the support guys.
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Old 06-06-2009, 06:54 PM   #5
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Thanks for posting the spreadsheet.
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Old 06-12-2009, 04:27 AM   #6
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I havn't forgotten about posting the spreadsheet.
Been having some problems with my home computer.

Posted PDF in separate post for more to see.
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