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I went to the Auburn airport and they told me not many airports have the ethanol free gas and most aviation fuel has ethanol in it too, it's just a high octane, which burns hotter, so the ethanol burns up before it makes an aircraft run bad.
For the northern boys Millinocket air hanger has the fuel anyone can stop and get it at the pump.
Sanford airport has it, I was told that Limington has it as well.
I put in all 3 --> marine stabil, star tron, and seafoam and have never had an issue with an engine (knocks on wood)
i just bought 4 mason jars and put gas in one, gas w/marine stabil in one, gas with seafoam in one, and a mix of gas w/stabil and seafoam in the fourth one, and punched a small hole in the lids. i'm really interested to see what happens. i'll update every few months for anyone interested.
only been 6 days and no change yet but i'm keepin my eyes on them and will report my findings for sure.
I have to add a word of caution on the Avgas. I used it years ago and in short order blew a new 200 hp high performance Merc. TheAvgas has way too much octane for normal applications, and the sleds/outboards are designed for it. If you use it your machine willfly, and run superb until you burn the rings right out of it.