Quote:
Originally Posted by Ram Jet
IWith premium she arrived with 1/4 of a tank remaining. What was the differecnce - a tail wind?
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Without knowing what car it was, it's just a guess, but some car engines have knock sensors, and will advance the timing until the computer hears the first hints of detonation. In this case, premium fuel could result in the ignition timing getting advanced quite a bit more than when using lower octane fuel.
Any yes, in a 300 mile trip, a 10 mph tail wind can make a significant difference in fuel economy.