Was curious as to the opinion on this matter in this forum. I've owned my Cobra for a few weeks now and it had never occurred to me to use anything aside from regular 87 octane gas in the car. Every car I've ever owned I've always just used regular gas in (86 IROC, 88 Z28, 89 Firebird, 91 TA, 99 V6 Camaro) and now I'm curious if the 01 Cobra I now drive requires anything higher than standard. There are no indications on the gas cap and went I Googled this issue, it brought me to another Mustang forum and an older thread on the subject in which the commentors were very split on the matter and frankly rather nasty about it. Figured I'd ask here where there seem to be cooler heads before I fill the tank again with regular.