I not only wouldn’t put e-15 in my engine operated equipment....I put sta-bil fuel storage with ethanol treatment in my vehicles and power equipment for the 10% ethanol that is in all gas around here.
The owner’s manual for my 2008 Mazda 6 specifically states that ethanol should be avoided, and under no circumstances should more than 10% ethanol be used.
I can buy ethanol-free gasoline where I live and that is all i put in the tank. I have found that in that specific car I get about a two MPG decrease if I use fuel with ethanol.