Originally Posted by mcredelle
i don't think i've ever seen anything more then 91 octane in all of CA. probably some regulation or something. Do the chipped cars need 93 to work well?
The chip companies I've communicated with asked me if my primary driving area had 91 or 93. To me implying that the tuning would be different. Not that if tuned for 91 you can't USE 93, you just won't be getting as much advantage as you could. I DO believe there would be a problem if they programmed you for 93 and you can only get 91.