When added to your diesel fuel, Rapid Power Fuel Reformulator acts as a catalyst by creating a more efficient burn in the piston chamber. A more efficient burn equals more horsepower and torque. Unlike fuel additives, the Fuel Reformulator will also increase fuel economy 3-8% (even in newer vehicles) and can produce significantly higher fuel economy upon first use. Another added benefit? Your engine will be kept free from damaging carbon build-up. One 8 oz bottle will treat up to 320 gallons worth of diesel. A case contains 6 bottles and will treat 1920 gallons of diesel fuel. Shipping $4.50 USPS in continental United States.