[GretchenGotGrowl]

With 93 octane you probably aren't going to see any timing pulled under normal conditions (when it is very hot you might, see below). Given there is a limit to how far you can advance the timing, I would say the short answer is no.

Now, meth also lowers IATs which results in a denser air charger. That may add a few ponies, but not a whole lot.

Increasing the CR is something we've talked about some. I do think you will see some gains from that, but it all depends how high you go. You may find that a 12.5:1 CR will run just fine on 93 octane. You would be in unknown territory at that point.