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I've ran E30 on my stock tune (with a boost controller) just to make the 93 setting run smooth. I'm tempted to suggest you just run an aggressive 93 tune on E40 and go back to a 91 tune when you can't get your hands on E85.
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2017 BMW M240i 6MT Slicktop | Wavetrac 3.46:1 Limited-Slip Diff - DinanTRONICS Sport Boost Controller - H&R Sport Springs - Millway Street Camber Plates - Agency Power Intake w/ Paradigm Engineering Turbo Inlet
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