In my opinion, E-10 is bad enough. I DO NOT use it in small engines (lawn & snow equipment, or my bass boat. E-10 runs like total SH!T in my Merc-equipped bass boat. I run Rec fuel in my boat now, all my small engines, & my Scat Pack Challenger. We are lucky to have around 5 stations in our vicinity that sell the E-0 rec gas.

E-15 will be worse yet. It will wreak havoc with any of your lawn equipment & small engines. Adding 5% more ethanol to our fuels will help NOBODY, in NO way. It will be worse for our environment too.