I’ve heard of (and experienced) the bad things that come when you run high concentrations of methanol, having raced on M-85 for one season, but I hadn’t heard that ethanol had the same corrosive effect. I also don’t know if the smaller percentages (10 to 15%) of ethanol would have any significant effect beyond what the additives that are already in gasoline would do to the rubber parts in your fuel system.
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