I've read the posts and looked a little bit at what's called "top tier" gasoline. Coming from the auto manufacturers and not the oil companies gives the concept of a better standard of detergent in the fuel a bit of credibility. If there were any companies that provide it close to where I drive, I'd give it a try.

My question though is; Has any one tried and can claim any noticeable gains with any of the numerous fuel additives you see everywhere? I don't mean something you might get from a performance shop, I mean just plain old STP or gum-out or whatever.