Crap, all the small motors, and any outboard, don't even "like" 10% Ethanol, and most small engines have clear DO NOT USE 15%!!! That $0.10 per gallon savings on the price of the gas, may certainly wreck far more financial damage in your engines...
I've been using Startron for years, but even that didn't work in cheapo weed whackers, was lucky to get more than 1 season out of them. When I splurged and got a Stihl one, I started using Stihl premixed canned gas for that, and generic premixed canned gas for all my small gas motors, chain saw, and leaf blower. No small motor ethanol issues now for 4 years. Really worth the extra $ since I use the chain saw maybe 5 times a year, but I know it's going to start right up and I'm not going to be
Last season I switched to ethanol-free for the boat, and the only things that now get 10% are the lawn mowers and snowblower, which are laced with copious amounts of Startron and stabilizer.