I think its also important to remember a couple of major things here about ethanol blended gasolines in all octanes and especially for marine use.
One the 4% to 20% less power from the burning of this ehtanol blended fuel will also result ins a good deal more fuel being used if the engines are re-tuned for ethanol to get the power differential closer to equal.
Second, ethanol blended fuels are very good about promoting the buildup fo moisture(water) in the fuel, especially when stored in a boats tanks for any moderate period of time and the negative effects of this added moisture in the fuel and its effects on fuel system components.
When you compare ethanol to straight gas in existing marine engines its not a good equal for gasoline from a lot of different reasons, however it is mandated now in may areas and seems to be the current cheapest method of reducing certain types of air pollution in gasoline engines.
I know and believe that the total contribution to air pollution from the total use of recreational boating is so insignificant compared to other contributors to air pollution that it is a crying shame that the Clean Air Industry and its beauracrats and policy supporters have hung this recreational sport with this and other (catalyst) costly and damaging stop gap technology sollutions!
Again, our BIG GOVERNMENT small minded solution with OUR DOLLARS! Pay attention, educate yourself and others and VOTE ACCORDINGLY! My final Word STOP THIS CRAP!!
Ray @ Raylar