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      11-03-2012, 10:14 PM   #8
328i M-Sport
Private First Class

Drives: 2011 328i M-Sport Sedan
Join Date: Sep 2011
Location: NYC

iTrader: (0)

Higher octane is more resistant to detonation. It can make more power by not reducing timing to avoid knocking.

If the car does not have a high compression engine or advanced timing, it will not benefit from it. Higher octane gas in theory actually burns slower. And most brand name gas stations put the same cleaners into the fuel for any octane.