Thread: Will 91 octane make a car get better gas mileage?
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KFC911 KFC911 is offline
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Join Date: Apr 2002
Posts: 30,933
Octane will not efffect mpg, but if you can find ethanol free 87 octane, you will improve it....enough to offset the price difference at the pump mebbe...YMMV...truly.
Old 05-20-2018, 06:37 PM
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