I use the Startron enzyme for gasoline diluted with ethanol. Have had no issues with my outboard. Have had issues with lawnmowers, weedeaters, blowers, etc. Ethanol in gas is a BAD DEAL for Americans. Increases taxes (by causing us to buy more fuel to go same distance), increases food costs, causes multitude of fuel related small engine problems. Lastly, it's a NET LOSS of fuel....consumes more than a gallon of fuel to make a gallon of Ethanol! I sure hope the current admin recognizes this folly and makes changes. Sorry if I've offended any corn growers, but there will still be a market for your crop. Maybe just one that doesn't STICK IT to the rest of us.