I've seen too many carburetors taken apart with thick gooey white crap deposited in them, as a result of using Ethanol. Rubber fuel lines turned to mush, or swelled up. The stuff gets real foul real fast. Phase separation they call it.
Absorb water or attract it, the stuff is garbage no matter how you look at it. Especially in an old car.
I run nothing but straight gasoline in the old cars anymore thank you.
Ethanol is a political tool sorry it's nothing else. And I live in the Cornbelt.
By the way I saw Kerosene today at over 4 bucks a gallon