I'm an O/O driving 70,000+ miles per year and recently started using you fuel treatment in every tankfull just to see if it really did improve my gas mileage as advertised. Unless my pencil slipped, I am netting a savings of 30 cents per gallon in winter driving. Now it's time to test summer driving. I can't say that I am one of the die hard faithful yet but I have moved down to the front pew for a closer look.