I put a little over 2 gallons in on top of my regular 93 octane, man what a difference. Im running 13 to 1 with the 998 kit. It runs so much smoother now, I was really surprised. There's hardly any exhaust smell either, it's alot cleaner I guess. Im going to run half&half from now on, Im anxious to see if dyno numbers go up from not pre-detonating.