Use a couple ounces of boostane to correct the unleaded then add the ethanol to E target.
That's my fix when I suspect bad octane in the fuel.
I use this app (android) when calculating Emix
https://play.google.com/store/apps/d...anolCalculator
And I also have an Ethanol Content Analyzer.
In the F22, I get the most accurate mix by calculating the tank to be 12.8 gallons instead of 13.
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2017 F22 M240i, Xdrive, M Performance Package
Active Autowerke Downpipe, Dinan Carbon Fiber Intake, Dinan Carbon Fiber Turbo Inlet, Dinan Mid-pipe, xHP Flashtool, MHD Stage 2
To do next list- #1- Wheel Spacers & Tires, #2- B58 TU Pump, #3- Flex Fuel Kit