[NorthMountain]

When ethanol was first introduced in gasoline, most engines were made with soft (rubber/plastic) parts that were incompatible with ethanol. It rotted the soft parts. Using other types of rubber/plastic solves the problem. For my own part:

1) I have never had any trouble with any 4-cycle engine of any size (weedeater to V-10) related to ethanol content in the fuel.

2) I have two 2-cycle engines. I have had trouble with the fuel lines rotting in both of them.

FWIW

[RegulatorCountry]

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.

[cymbeline]

” I have two 2-cycle engines. I have had trouble with the fuel lines rotting in both of them.”

Hmm. My chainsaw got a broken fuel line where it went into the tank. Maybe that was rot. My weed eater is acting up. I got replacement fuel lines and a carb rebuild kit for it.

I read up on ethanol-infused fuel. Looks like it was a bad idea. It was done to reduce our dependency on foreign oil.

[Elsie]

I have had trouble with the fuel lines rotting in both of them.

Me; too.