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I put 2 gallons of 101 octane Trick in with a tank of 92 0E. It's all unleaded of course, no ethanol whatsoever, and seems to make the engine run crisper during track days while providing knock suppression. This brings octane up to optimal levels for this high compression motor, right around 93.5
It costs me about $12 more a tankful but is worth it. I still average 34mpg on the street.
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