Things I have learned...
Old hoses and tubing and rubber gaskets (made before the '80s at some point) gets dissolved by alcohol. This applies to outboards, inboards, lawnmowers and chains saws....
Alcohol "eats" fiberglass fuel tanks.
Alcohol "cleans" the crap off the bottom of an old fuel tank. That crap goes somewhere bad...
Alcohol absorbs water, so some of the water in your tank will not settle, it will get mixed in the fuel that goes to the engine, which is bad.
Half of the boating world says keep a full tank so you don't get moisture in there, the other half says only put in what you use so it doesn't "age" in your tank, the third half uses wind power....Pick a half and go with it...
At some point in time, when is up for debate, the ethanol will separate from the gas and bad things happen
I use Startron to prevent this. Does it work? Is it just expensive snake oil? I don't really know.
You MUST have a Fuel filter/Water separator regardless of whether you use ethanol or not.
E10 is ok for outboards. E15 is not.
I have been using E10 for years and have not had any problems.
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