Reviewed By Thom F (Rockford, IL) Reviewed for a 2007 Mazda Miata/MX-5 —4/18/2012 4:18 PM
Have used for years. Mileage increases with use. MX5's have problem with pre-detonation. Never happens with Fitch treated fuel. I even ran 87 octane with no "Ping". With no pinging, cam and ignition timing stay advanced improving performance.