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

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

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I think he would be more concerned with detonation
with the lower octane(less ethanol)

I was told if you did that to raise octane, you need to use UNLEADED race fuel because the lead and ethanol do not mix right.
Don

thats what I was told also do not mix leaded race gas with E85 ask Mark Sullens

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