Thanks Demon... I guess I was referring to the fact that mr. Speed Demons doesn't have any radical performance adders that would require higher octane.
I've never had my car ping, I guess it doesn't get driven much in very hot weather. '98 has less static compression, maybe that's a factor too.
Stinger00, I think the xylene/toluene is perfectly fine. I know of some local boost junkies who use it regularly.