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Just start mixing already and log the results. Once down 100 miles top off with E85, first tank will be e20ish. Come next refill put in 8 gallons E0/10 top off with E85, calculate the E% and just keep on going. To really test if your fuel pump & injectors can keep up you'll need to do a run or 2 after it's adjusted the fuel ratio and can supply enough fuel. I'm guessing good to E50 after than might get a CEL.
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