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Old 07-28-2008, 01:23 PM   #6 (permalink)
bikin' Ed
Master EcoModder
Join Date: Jul 2008
Location: Tallmadge, OH
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I've always used the lowest octane that my car used w/o knocking. In some cars that meant regular driving through Indiana and premium in Vest Virginia. I never noticed a chang in mpg that couldn't be attributed to terrain and/or traffic. But if it is getting you better FE I say use it until the tank before your e-check if you have one.
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