I'll second tahoeacr. The other thing to remember is that a PCIII doesn't take into account a lot of the elevation changes, at least when I was studying it.
The long and the short is that it's expensive to do the Tuneboy or TuneECU software by someone who knows what they're doing. That said, it is so worth it.
Ken Wheeler did mine at his shop at Deals Gap along with my RC8 and my dads RC8. All three bikes are fantastic now: more power, better mpg, and smoother throttle.