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Old 05-22-2009, 11:10 PM   #17 (permalink)
stevey_frac
EcoModding Apprentice
 
Join Date: Jun 2008
Location: Cambridge, ON
Posts: 240

Jalilah - '07 Chevrolet Cobalt LT
90 day: 40.57 mpg (US)
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Quote:
Originally Posted by roflwaffle View Post
All things considered there shouldn't be enough difference to warrant high octane fuel since the effective compression ratio should be pretty low.

I'm more concerned that you accidentally run it lean when your retuning, which is something that promotes heavy knocking. Standard operating procedure is to run race gas (110 octane) when you are tuning a car.
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