Here is a cut and paste from Sta-Bil.
Stab-Bil's Ethanol Treatment formula was designed to prevent corrosion from moisture and ethanol induced water attraction. It is the best ethanol problem fighter with more than four times the fuel system cleaner and twice the corrosion prevention than Sta-Bil, as well as two non-alcohol water removers. It was designed for use with every fill up in all 2-4 stroke marine engines running gasoline, gas-oil mixtures, and ethanol blends, and it can also be used as a safe storage treatment in snowmobiles, motorcycles, motor homes, and all outdoor power equipment including lawn mowers and tractors.
Hope it helps.
Art