Here in Oregon I have to go to the gas distributor and have a special card that says I'm smart enough to pump my own gas to get " clear unleaded" with no ethanol. I've heard gas absorbs about 6 ppm of h2O but ethanol absorbs 6000 ppm. Even the fuel distributor says it's bad for all carborated engines not just 2 strokes. I think it's worth the trip just like what you have to do for racing fuel. I run 87 octane with Amsoil sabre 32:1 gas right now $3.60 gal + 4 oz amsoil for $2 so I'm paying 5.60 a gallon with oil. But I think it's worth it. Erhanol is for drink' n not burning.