The ethanol companies associated with crappie masters are trying to say the ethenol has no adverse effects when running it through marine engines. The is true to a point. The bad thing about ethenol is that it is alcohol and alcohol has a natural affinity to water. So if you store your boat for a week or two without treating the fuel you are asking for problems. On another note. I am all for american farmers but ethenol has raised the price of corn which in turn makes the price of beef five dollars a pound. Overall in my opinion I think ethenol as fuel is a failed experiment at alternative engery. Again just my opinion.