Quote Originally Posted by six2go View Post
I think this is pretty much the case. I have a VW GTI which the manual says requires premium. According to the GTI Forum, it will run just fine on a lower octane except the computer makes adjustments in the timing to avoid detonation but at a small sacrifice in HP. I wouldn't know since mine has never had any gas other than Shell V-Power and all is well.
Agreed. I also had a GTI after the Vanagon and ran it on 89 for several years. I ran like scalded dog and never pinged...ever, AND it was chipped with Austrian software which was recommended by the dealer. That GTI needed wings for take-off. It was a blast to drive.