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The gas cap states E-10 is fine...Which means thats conservative. If you go 3/4 93AKI and 1/4 8-85 which is 85% Ethanol, 15% gasoline and detergents (BP e-85 detergents are bmw approved) ....if you do the mathe thats 40% ethanol in 25% of the tank.
E-100% would be 25% ethanol. 50% would be E-12.5...40% is a ittle under 10%
I was told from a very experienced N55 guy 30% was OK...avoid much higher...
There are reasonably priced systems that measure ur ethanol percentage...Perhaps another user could get more specific.
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2020 BSM X4///M-2016 BSM ///M2- 2011 668 ///M3 |