Lucas Gallon Fuel Treatment. A powerful blend of oils and additives with no solvents, this treatment increases power and fuel mileage while lowering exhaust emissions through more complete combustion. Formulated for both gasoline and diesel engines, carbureted or fuel injected, it cleans and lubricates the carburetor and injectors, causing the fuel to burn more thoroughly for increased power and less fuel consumption. It can be used in vehicles that require leaded fuel, replacing the benefits of lead in gasoline without causing harmful emissions and can be used to pass smog tests.