Switch to E85

T56MaxTorq said

So is there a "tried and true" E85 conversion when using a gasoline gauge?

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No just like Gas there's no one size fits all A/F.

Again, I tune a few hundred turbo 4cly a year and most are on E85(400-600whp), i have plenty of experience with it. Stick in the 11.5-12.0 range for your low boost V8 and you'll be fine.