You can prolly check with Johan over at Diablo.. I have been running the 93 tune with 93 octane gas for a few tanks and the truck seems to be getting better and better as the computer adjusts to the new parameters.
I figure its only a couple bucks to fill up with 93 octane as opposed to 89 or 91 octane. You just have to make sure that you can get that octane where you are.
Johan just sent me a custom tune that helped with the tranny shifts and now its even better than it ever was.
Check this link, Johan has some recommended PIDs to log, you can also download the DCX file and put it in the right directory on your laptop so that its already setup for the PIDs..
Hope that helps..