VP Racing Fuel System CleanerVP Fuel System Cleaner with RP21 is perfect for cars, trucks, boats, and motorcycles. We use an advanced cleaning agent - our PEA detergent gets deep down to quickly clean your pistons, rings, and valves, even under severe operating conditions. As a result, it brings your engine back to life. We formulate it for both street and off-road applications.In addition, our product virtually eliminates knocking and pinging. Furthermore, it reduces the harmful effects of ethanol and cleans carbon and varnish from fuel system components to keep your engine running smoothly. You'll notice an improvement in gas mileage as well.One 16 oz. bottle treats up to one tank or 20 gallons of fuel for up to 5,000 miles.Features; Performance Advantages Cleans & restores engine components, including carburetors, fuel injectors, rings, intake valves, and combustion chamber Stabilizes fuel against harmful effects of ethanol and water Provides faster acceleration Results in easier starts Reduces emissions Adds lubrication Includes corrosion inhibitors (vapor corrosion inhibitor) 30% improved corrosion, stability, and cleaning performance compared to average results of competing brands