I use cheap 85 octane in my 87 octane vehicle and don’t notice difference. The top tier have the most additives. It would be nice for the to take the junk alcohol out. My old tractor requires good 60 octane gas and I can not find any.
I’ve tried 93 ethanol free in my 16 Tacoma and I didn’t see much of a difference in mileage.
With my commute, there is no time for regular fuel to deteriorate.
Old stuff like the 750, K5, and both CJs when they are operational get the ethanol free.