Ford Mustang Forum - View Single Post - 93 Octane (10% Ethanol) v. 87 Octane (Ethanol free)
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post #7 of (permalink) Old 01-21-2016
zinc03svt
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Joined: Jul 2014
Location: Springfield
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It's "best" to go full e85/e70 etc. or stay straight clear pump. Mixing creates inconsistent fuel and or tuning. Are you testing that ethanol content at every fill up? Reason? Because corn has different stoich than regular pump.

Yes, the ecu will correct/compensate to a degree. You need to run logs from the station/s you use for fuel. Your tuner should dial in best he can.
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