Do you have data for this? Data I've seen would show about 1 point of octane higher, take 91 to 92 octane.

Nothing higher than 91 here in Western Oregon, even the non-ethanol (which is tougher to find). My car had a 91 octane SW chip in it when I got it, which was installed by the PO in Washington. So I'm guessing no 93 in Washington state either.

Toluene is the primary ingredient in those. Alot cheaper, and you need like 10% to have any effect on your gas. That's alot more then you get in one bottle.

I'm leaning towards adding ~5L of toluene before I fill up the tank in my turbo project, since most Canadian premium has such a low octane.

I run 91, occasionally 92 when I can find it but 91 is what's around town here and we've had no problems whatsoever. Don't waste your money on ocatane boosters. I do know some guys who are running some pretty exotic motors and go to the airport and buy 104!! but I'm running a stock 3.2 and do fine w/pump gas.