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A modern engine designed for ethanol will generally run well on it but mpg is impacted a fair amount, try ethanol-free in the correct octane and mpg will increase 20-25%. Other than that, the black mold or whatever that starts growing behind the fuel door is the only other issue with it. People deny it strenuously but it's the same stuff that grows all over buildings in towns with breweries and distilleries, parts of Kentucky have a big problem with it as do some towns in Scotland and Ireland.

I gave up on trying to run lawnmowers and weedeaters on ethanol fuel though, I kept having to take the mowers into the shop. Started buying ethanol free at the local marina on the lake, paid through the nose too, no problems since. Ethanol-free is much more widely available now and not at marina prices, still a premium over ethanol of same octane but not much, maybe ten cents a gallon more.

A modern engine designed for ethanol will generally run well on it but mpg is impacted a fair amount, try ethanol-free in the correct octane and mpg will increase 20-25%.

My pickup has a "flex-fuel" engine. When a nearby gas station installed "E-85" pumps, I tried it. I got about a 30% reduction in the price of a tankful of fuel, and about a 25% reduction in miles per tank. Not terrible economics for local driving, but I wouldn't use it for road trips. In practice, I just don't use it at all. Not worth the hassle.

I gave up on trying to run lawnmowers and weedeaters on ethanol fuel though,

Your experience is different from mine. In 4-cycle small engines, E-10 "regular" works just fine for me.