Getting harder to find but there is a list of vendors available on the web somewhere that lists. in Canada and US, which brands are really ethanol free.
I am lucky to have a Card Lock system available in my rural area that carries high test with no ethanol....... use it for everything gasoline run. I always leave my tanks full when the vehicle is stored for the Winter. All my gas is stored in plastic containers and keeps well over a year tightly sealed.
Many antique car forums in the USA have discussed this issue extensively and have quoted reputable sources and all support Premium fuel and consider most fuel and oil additives as wasting money. Time and time again it has been pointed out that changing the oil on a more frequent / regular basis ( and mileage alone is not a good criteria) is more important than using premium oil. Cheap insurance as they say.
Cheers
Found one site
https://www.pure-gas.org/