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best gas...chevron 94 sucks
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  1. Canada
    Hey Fellas; I have a Switzer R1K and have recently been sent a retune/flash for a more "ultimate" pump tune. These tunes were done on 93 US Octane which contains about 10% Ethanol. I figured the Chevron 94 Octane should do the trick. Alas, knock sums indicate it does not. Boyan from...
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