I live far below the Mason-Dixon line and I can't comment on ethanol in colder climates but I can tell you that I treat any ethanol gasoline for my small single

I live far below the Mason-Dixon line and I can't comment on ethanol in colder climates but I can tell you that I treat any ethanol gasoline for my small single cylinder engines in the can when I fill it up since we have such high humidity in the South in the summer and the ethanol will increase the moisture content in the fuel.