[supereal]

You can use ethanol safely if the concentration doesn't exceed 10%, providing all non metal parts of the fuel system (rubber,etc) have been replaced with appropriate materials. At our shop we went to "fuel proof" hoses and other parts long ago. Even fuel marked at the pump to be ethanol free does contain it now in shipment and multigrade pumps. The real losers in the battle are the small engines on mowers and other applications. There has been a push to increase ethanol content to 15% and above which will likely be the point where damage will occur. It is spurred by a surplus of corn at low prices