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Old 07-06-2008, 12:19 PM   #89 (permalink)
Formula413
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Join Date: Jan 2008
Location: In the Northeast dreaming of the Southwest
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Aegean C - '17 Honda Civic LX
90 day: 42.48 mpg (US)
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Quote:
Originally Posted by bryn View Post
high octane fuel will only increase mpg if your engine needs it to keep from knocking.
the lowest octane your car is made for will have the best milage return.
the additives that keep higher octane from pre combusting under high pressure/heat don't burn as well in a normal engine.
some higher octane fuels claim to help your engine run cleaner but a bottle of fuel injector cleaner when you change your oil will have about the same effect
Correct. Also keep in mind that E85 has a much higher octane rating than regular grades of gasoline. 105 to be exact.
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