Nothing really wrong with ethanol blended fuels as far as engine performance is concerned.
It does soak up some water in a vented system, so plan accordingly.
It will also swell up and destroy most accl pump seals being supplied today. My accl pumps and seals are impervious to it and the only ones out there with a lifetime warranty in any type of fuel.
Below is a pic of what happens to the "blue" or "black" pump seals from your kit if you didn't buy it here.
My seal is on the right. These pics were taken during a class I put on couple of summers ago in front of many witnesses. At the beginning of the class I put all three seals in pump fuel at 10 percent ethanol.
A couple hours into the class we took a break and this is the result. Swollen pump seals result in difficult or "no-start" scenarios after the carb sits for a few days, and eventually they either roll off the pump or rip/tear. Between fuel evaporation, drain back and none getting past the seal to fill the pump well on the upstroke of the pump cold starts are a real issue.
This is almost ALWAYS miss-diagnosed as a bottom plug leaking issue and starts a chain of events where the owner starts all sorts of needless repairs to bottom plugs that were NOT leaking in the first place.....FWIW.....
