CleanBoost Fuel Pills 6 Pack for Gas & Diesel Fuel CleanBoost Fuel Pills are a quick, convenient & cost effective way to improve fuel economy, extending the useful life of your engine. CleanBoost Fuel Pills have been tested extensively by independent labs, shown to reduce carbon particulate emissions and improve fuel combustion. Benefits include Increased Horsepower and Performance | Reduce Greenhouse Emissions | EPA Registered. Add 1 Capsule for Every 15 Gallons of Gasoline or Diesel Fuel.