Oh, sorry to offend. I've had great luck with small engines since I switched to non-ethanol, but it's just anecdotal, I realize that. As is your experience of E10 storing better.
My Husqvarna chainsaw manual specifically recommends using non-ethanol fuel.
Do you disagree with the following statement clipped from the bobvila.com website:
Ethanol-blended gas lasts up to three months.
According to the
U.S. Energy Information Administration, most gasoline sold in the U.S. is “E10” gas made of 90 percent petroleum-based gas and 10 percent ethanol (ethyl alcohol). Ethanol-blended gas usually has a shelf life of up to three months because of the high speed at which ethanol oxidizes. Because ethanol is hydrophilic (a.k.a., water-loving), it will also readily absorb any water or humidity in a sealed container resulting from condensation, causing both moisture contamination of the fuel and the eventual separation of the fuel into distinct gas and ethanol layers. Generally, the higher the ethanol content in the gas, the shorter its shelf life, so E15 (15 percent ethanol content), E20 (20 percent ethanol), or E85 (85 percent ethanol) gas will expire sooner than E10 gas will.
Pure gasoline keeps for at least six months.
Petroleum-based gasoline without any ethanol will still succumb to oxidation and volatile compound evaporation in a sealed container or tank, but these processes usually occur more slowly in pure gasoline, so you can usually expect it to last at least six months when properly stored. Because pure gas is hydrophobic (a.k.a., water-hating), it doesn’t absorb water or humidity as ethanol-blended gas does, which allows you to avoid moisture contamination and fuel separation issues.