I talked to a small engine repair man who has done his homework. He said that the average person may go to a gas station and get 2 1/2 gallons of gas or 5 gallons and he checked it out and he found that in about 2 weeks you have total separation of the ethanol and know one uses that much gas in your small engine in 2 weeks and sooner then later your are dumping straight ethanol in the tank. No good!!!!! The good news here in Pa. we have quite a few stations that sell ethanol free gas.