Quote:
Originally Posted by cjpp78
Cool to know. I ran around 16 - 17% ethanol on a 2019 440i I've been leasing with jb+. one gallon mixed with 10 gallons of 93 octane. Around 94 octane. Car seemed to run stronger more consistently with the ethanol. I'll be turning the 440i in soon for a M340
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The new B58TU and B46 have upgraded HPFPs (the same pumps as in the Supra which are popular upgrades for the 340i/440i with the older B58). So you can run fuel with more ethanol than you did in your 440i.