Ethanol can screw with rubber hoses, gaskets, runs a bit hotter, and in any of my vehicles gives slightly less mileage than gasoline without it. Back in the '70's, when gasohol first hit the scene, garages were doing a bangup business in carburetor work and replacing fuel line filters, particularly in older cars/trucks. What was happening was the alcohol in the fuel was loosening up sediment that had settled to the bottom of the gas tank over time. This sediment was then pumped into the engine and plugging up fuel filters and messing up carbs. Todays engines are alleged to be ok with up to 10% ethanol or 5% methanol in the fuel blend. I run it occasionally in my Tacoma and the only difference I see is that I get about 18.5mpg instead of the 20 I normally get with non-ethanol fuel. My regular fuel stop for the bike is a non-alcohol station just up the road from my home.
Tell your dad that Sta-bil is making a marine grade product that may help. SeaFoam may also do the same thing.
Real gun control is having the ability to hit your target.
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