I use ethanol gas in everything that I own. I actually think that it is 15% ethanol. I use it in my Ford 2000 tractor, Husquvarna chain saws, pressure washer, both portable generators, Gravely walk behind mower, every lawnmower on the place, Echo brand string trimmers, all of my cars and trucks, and anything else that I've missed that has a gasoline engine on it.
I've never had a minute's trouble from the gas. I leave it in the fuel tanks through the winter, and have never had trouble in the spring when I get the tool back out.
Maybe I'm just lucky, but in my experience, the hoopla about ethanol is just that - hoopla.
Tom in TN