pgcays.

Thanks for starting this thread. I've always wondered about this topic. I'm gotten different answers from different auto mechanics, so I've always thought that there was nothing to this, given that I've got controversial answers. I've been using the Costco gas since they are located right next to my work, and it helps that they're cheaper than the others. But I've recently noticed that they're only 91 octane. Guess the antiknock sensors help deal with that. But, perhaps I need to change my ways............Will definitely follow this forum. pgcays, you will find there are alot of people on this board who are great resources! Congrats on your new Cayman.

Cheers,
Jim