Perhaps the brand of gasoline is even more important. Always look for fuels labeled as TOP TIER. If I am not mistaken, E-85 is 85% ethanol and 15% gasoline. I am ashamed they even make the stuff as alcohol is useful as a fuel only when you run out of gasoline. Causes corrosive activities in your engine components, cause terrible fuel economy and costs about $3.00 a gallon to make. I will stand with my previous position in that alcohol belongs in people, not in engines. I did notice several places in New York are now selling 100% Gasoline with NO alcohol. Filled up the truck and gained about 3 mpg. Of course it costs $$$$$$ but...