I really wouldn't play with that stuff yourself, I've seen many people take perfectly fine vehicles and screw up the timing, a/f by tuning it themselves.
Go get a multi position chip like a Superchips one and get custom programs made.
I've programs for 87 octane, 91 octane and C12 unleaded race fuel.
This stuff should be done by a professional tuner. Don't waste your money, from what I've experienced when I'm with my tuner is fluctuations in A/F at 100rpm increments, nothing as vast as 1000rpm increments, I would have to say they're pretty much useless, if my tuner increased something by 5% over the 2000-3000 rpm rev range he would have made my running lean from 3500-3600rpm range 5% worse.
Save your $300 for a dyno session, that can usually get you 4 hours with a tuner on a dyno and your car will never run better. My car runs better with a Blower than it did stock.