Gary, as an experiment that will be interesting.

My goal is to see what can be done with good ol' commonly-available pump gas. I don't have the facility for a test stand so it would be of great interest to me to see the difference you find between 87- and 93-octane pump gas.

I'm getting around and perhaps a bit over 9K rpm with 87 octane (10 % ethanol), which isn't too bad!