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Why would you want to blend it? It's 85% ethanol and why would you want to change that?



I think he is saying if it falls short of the E-85 rating




Yes Mr. P your correct. Sometimes it less at the pump and if you tune your car for 85% it may run lean.



Actually the motor would be rich, not lean if the percentage was less than 85% and you were tuned for 85%.