I called and spoke with someone at LMS a year ago about octane booster and they strongly discouraged me from using it. I have heard of guys feather footing the throttle till they could get the normal 93, but I'm too paranoid to do that except as an emergency last resort tactic. Sooo...I just bite the bullet and load in a 91 tune. Maybe next year when I head out to Maine, I'll try the 91 version of 4 instead of going back to 2/3.