Originally Posted by benjamin
If the owner's manual specifies a minimum of 87 octane, don't waste your money on anything higher.
Octane is a rating of resistance to ignition. Engines running higher compression require a higher octane. Read about it:
http://auto.howstuffworks.com/question90.htm
This is true....however I tried an experiment last sunday when I moved down to San Diego. I had all sorts of stuff in my car, so the back of my car was sagging. I put a tank of 92 octane fuel in my car, to see if it would make a difference climbing that huge grade before you descend into LA. The car had no trouble getting up that grade, despite it was a good 500 pounds heavier. That would be my only reason for putting anything higher than 87. Anything else is useless otherwise.