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Good 85% mixed 50/50 is E47.
Winter 75% mixed 50/50 is E42.
I'm a lab rat...prefer to test and mix quality fuels within 2% of my target for my custom "kill tune". OTS and mild custom tunes have a little wiggle room for octane and ethanol mix, but a custom kill tune does not.
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'18 F80 Base 6MT | '19 F82 Exec DCT | '18 F82 Comp Exec DCT | '23 G80cx
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