I all honesty, I've been using E10 87 octane in every piece of power equipment, tractors, cars, etc... since the 80s and have yet to see any ill effects. I just follow the manufacturer's recommendations as to long term storage. No issues. I fill three 6-gallon plastic cans in the fall. If I don't use it up snow blowing (haven't in several years), I dump it into my Suburban and refill in the spring.
I only own one piece of equipment that requires higher than 87 octane fuel (a larger chainsaw), and that octane doesn't have ethanol in it anyway.
I just don't see the problems that other folks report.