High octane numbers don't do a lick of good if a winter's worth of condensation is mixed in with the fuel.... Real gas for my boat, please.
Additionally, running your motor on LOWEST octane that doesn't cause spark knock is generally recommended- higher octane allows more performance in motors that are built for it, but no added benefit for a stock motor designed for 87.... My lawn mower really doesn't need 105 octane corn blend in the tank.

How can we join Mercury Marine's effort in fighting E15?


I'd like to Support Mercury Marine in this effort.




.

Granted I don't have a 300 gallon fuel tank in my boat but you let any fuel gas or ethanol set it will all go bad. I have used 93 octane which has ethanol in my boat for over 10 year with out any fuel related problems. Of course I do use my boat every weekend or more. There is a lot of pro's and Con's and most boaters do use the ethanol blend fuels ect for a few. And for the few that don't like ethanol in their fuel Mercury has a cure in a bottle, You family friendly Walmart has it in the oil isle so check it out or pay more money per gallon for ethanol free fuel ether way ethanol is not going away but at sometime in the future the ethanol free fuel will be.

Like SS930, I cannot find ethanol free gas near Houston. All marinas and car gas stations I have seen are E10. So far no problems in my boats or cars but I use blue Sta-Bil on every boat fill up. Anybody know anything about "GULF MARINE 100 with ISO BUTANOL " on one of the comments? Is this a viable alternative to booze gas?

I think I would disagree with you here. The stoichiometric value for each fuel is as follows:
Gasoline :14.7:1
E10: 14.08:1
E15: 13.79:1

Max power air fuel ratio:
Gasoline 12.5:1
E10: 12.0:1
E15: 11.75:1

Almost any marine motor that was originally setup for standard gasoline will have drastic issues with E15. Even with a typical margin of 5% which would be high, your still leaner than peak power of E15 and just under E10. If the calibration, or carbs are not adjusted, you can see at least a 50deg EGT increase during peak RPM levels, further taxing the engine components. You then have to factor in the detonation level, as you've increased temps, leaned the motor out, the detonation level gets closer and closer. The results are lower power, increased fuel consumption and higher level of emissions as the volume over comes the benefit of the ethanol.

We had to significantly richen our calibrations up for E10 to make the motors live, E15 would do the same. But when we do this, we lose HP. OEM auto makers state that this could hurt 2 out of every 8 vehicles on the road today. The fuel systems simply were not built for ethanol in most applications. Only the later engines have proper injectors, orings, seals, gaskets, pumps..... And then only some boats have tanks that can actually withstand the massive corrosion issues associated with the ethanol fuel. E10 has been bad, E15 will be worse.

WG,
Is correct, in fact I've found a gas station over in Satellite Beach, (15 miles away) that has 93 Octane PURE Gas! And man does my new 572 love it! Go to:


http://pure-gas.org/?stateprov=FL

and enter your state and it will tell you where the non E10 stations are. It seems very accurate.