I've gone back and forth using both 100% 93 octane and 10% ethanol 93 octane, and I have monitored my mpg using an iPhone app (road trip). In two years, I have not seen a difference in mpg or power. Had I seen a difference, I would go out of my way to use the better fuel. I want to be an ethanol hater, but I have no empirical evidence .
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