Where I live, it seems like everyone sells this stuff for ethanol treatment. All the motorcycle/powersports dealers, etc. When I bought my (junk) mower a few years ago, the dealer told me to
always use this.
https://www.amazon.com/Star-brite-Enzyme-Treatment-Additive/dp/B00EZSPU3U?tag=sxsweb24-20
I can buy the non ethanol gas around here, but I don't anymore. Newer fuel injected vehicles like the P500 are designed to handle 10% ethanol in the gas, so I don't worry about it. And if my weedeater croaks from the ethanol, I'll buy an electric one. haha