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Does octane affect mileage inversely? (archive)
[ Follow Ups ] [ 5-series (E39) Message Board ] [ Msg. Board FAQ ]
Posted by Marketing hype? on December 10, 1999 at 16:49:19:

I find that when I put a lower octane gasoline in my car,
my mileage goes up. I get less miles with a higher octane.
Am I missing something? Could all that marketing about
higher octane being better be hype? I keep the octane above the minimum required for the car. I've tried the test several times, and it seems to be true every time. This is
for an 1990 Acura Legend, not a BMW, but I wonder if the
same would hold true for BMW's (which I'll own one soon). I
notice NO difference in power with a higher octane level.
The only reason I would use hitest would be because the
engine would be kept cleaner (or is that a myth also)?????

Confused

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