Ron , Mon , My Pon, How Fuel is rated. Dec 12, 2013 18:01:13 GMT -4 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by justyfied on Dec 12, 2013 18:01:13 GMT -4 Here is a nice little write up on how Fuel Octane rates are derived.thoms1.net/Ford/Reference/RONMONPON.html