I just installed an HPP3 program on my truck. All of the posts I have seen, and all other owners that I have talked to, concluded that the 93 octane program didn't provide enough improvement to justify the extra fuel cost. Somewhere someone posted the HP and torque gains claimed by Hypertech for the 87 and 93 octane programs. For the 03 trucks, the 87 and 93 octane provided the same HP improvement, and only added a couple of lb-ft of torque going from the 87 to 93 octane program. The 02 truck numbers were similar, although there was a slightly larger difference between the two programs for 02 vs. 03 model years. Overall the numbers seem to back up everyone's conclusions that there isn't enough difference to be worth the extra cost at the pump.