The compromise is now over, with Gumout Supreme Fuel Injector Cleaner + Octane booster you no longer have to choose between clean fuel injectors or octane boosting performance - you can have both. Over time carbon buildup can clog fuel injectors and intake valves robbing engines of fuel economy and performance while also increasing exhaust emissions. Gumout Supreme Fuel Injector Cleaner keeps carbon deposits from forming on critical engine parts maintaining performance and fuel economy. Made with genuine MMT octane booster Gumout Supreme Fuel Injector Cleaner also increases the fuel's octane rating to ensure proper combustion, smoothing rough running engines, stopping knocks and pings, maximizing horsepower, while improving acceleration and throttle response.