E10 gasoline contains 10% ethanol alcohol and E85 contains 85% ethanol alcohol
Ethanol releases less energy and compared to non-alcohol fuels, it gets a lower mpg rating.
Ethanol is really bad for your engine
Ethanol is a solvent, it can dissolve fuel system parts, rubbers, plastic, certain fiberglass, and even aluminum. The rubber that is used in fuel system parts, such as seals and hoses, may shrink, swell, or lose strength when exposed to ethanol reformulated gasoline.
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