How nice would high octane gas be?

ir3333 said
Did you use stabil before storage?
I took my car out for the first time time a couple of weeks ago
and it detonated badly.It is Shell 91 from last Nov. and i used stabil.
..is stabil a croc like octane boosters and zinc,water wetter and all the rest?

The ethanol formula works, as long as it's used while the gas is fresh. I prefer seafoam myself.

I take that back. I prefer 100% petroleum fuel, in which I never had to (pay more to) add anything.