I know everyone uses either race gas or 100LL aviation fuel.
But right down the street we have 91 octane non-ethanol. I use it in ALL my lawn equipment, basically everything with a carburetor.
I'm sure I'll follow suit at the track with race or aviation fuel. I don't see the harm in using 91 octane in a car with 7.3:1 compression. We could probably run 87 octane(without ethanol of course).
What say you?