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      02-03-2013, 11:42 AM   #17
roundel335
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Drives: 13 335i Sedan, 16 228i Cabrio
Join Date: Apr 2010
Location: Leland, NC

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First of all, all modern BMWs (except the diesels) require premium (also known as high-test) gasoline of at least 91 and preferably 93 octane due to their relatively high compression ratios. This goes for normally-aspirated as well as the turbo engines. Secondly, "watered-down" doesn't make sense for RaceTrac or any other gasoline. It's either 91- or 93-octane or it isn't. If they're selling 87- or 89-Octane as "Premium", that's blatantly against the law and your state government would nail them for it. What distinguishes one brand of Premium-grade gasoline from another is the additives, such as ethanol, detergents or other similar chemicals. Look at it this way - there aren't specific refineries for every brand of gasoline out there, so unless the station's tanks were contaminated with water, there wouldn't be much difference in RaceTrac's high-octane and any other Premium fuel aside from ethanol content.
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2013 F30 335i M-Sport 8AT/MPE/MPPK/JB+, 2016 228i M-Sport Cabrio 8AT