Gas with ethanol has a shorter shelf life so you have to add Stabil or equivalent when storing your car. Ethanol does cause damage to your car no matter what they say and gas wth ethanol gets poorer gas mileage, dries out rubber, any water in it causes corrosion, if you had any water in your gas tank it will get absorbed by the ethanol.
I prefer my ethanol in single malts, beer or whatever.