In Reply to: Octane urban legends posted by EWB on April 04, 1999 at 19:14:19:
After writing "It would be a great CarTalk question"... I looked on thier page and found it has been discussed. Check out these links
One upshot is DO NOT USE A LOWER OCTANE GRADE you may damage your engine. And a higher than required grade is worthless (though harmless).