Fact: Engines designed for leaded gas have soft valve seats, unleaded ruins the valve seats. Install new valve seats it can run unleaded.
Fact: ethanol shrinks rubber seals, causes air leaks, ruins saws. again insert flex fuel argument here for better seals.
Fact: ethanol is hygroscopic and absorbers water from the atmosphere. it is also a solvent when it settles out of the gas/oil and washes off the oil layer and rusts your bearings. When it mixes with mater vapor it settles out of your gas, Its the octane controller. Suddenly your gas is sitting in the low 80's for octane rating and your detonating all over your sexy squish band.
I have a lot of old saws, I'm not trying to find rubber from the 1960's. I DON"T, i don't mean try, USE ETHANOL IN 2 Strokes. It has countless downsides and only one unrelated upside.
The only good ethanol is Stolichnaya and should only be ran in my 4 stroke liver. It kills me to see you guys who know 90%, to this guys 10%, talkin enough #### to make him think his correct information isn't. How do people learn. There are no dumb questions unless you have asked it 3 times in a row. (this op may have)