ok, here is the reason I ask. I want to be able to run race gas allowing me to turn the boost up a bit when needed.

I have a dyno session coming up and was wondering if I can just put the race gas in, hop on the dyno, make a few baseline runs, and then up the boost until I hit the desired a/f.

I want to know what my normal a/f is when I'm driving everyday, but I also want to be able to tune the boost for race gas.

If octane doesn't effect the a/f then I can use the race gas for my dyno session. If it does change the reading then I need to just use pump gas to find out what my true readings are.