whats the maximum compression that can be run with 93 octane fuel?

personally in my own opinion i dont like to run anything over 12-12.5:1 on pump gas. and even with this comp ratio i still use 93 octane with an octane booster every other time i fill up the tank.

im running 13.5 on the trail with 93 octane and some timing advance, its been like this for a couple of years. I think it depends on the exact motor as in piston and head shape and how close you run your jetting, your brands pipe design etc etc.

thanks for answering guys!

I'm running 175 psi out of both cyl's about 12.7-1 on 93 oct and stock timing,seems to be strong,like the others said wouldn't go any higher.