Fuel additives are compounds formulated to enhance the quality and efficiency of fuels. Gasoline additives typically increase gasoline octane rating or act as corrosion inhibitors or lubricants.

Gasoline and gasoline additives produced and commercially distributed for use in highway motor vehicles must be registered. Fuel intended for use exclusively in off-road vehicles, engines, or equipment is not required to be registered. Under the registration program, manufacturers are required to analyze the combustion and evaporative emissions generated by their fuel and fuel additive products, survey existing scientific information for each product and, where adequate information is not available, conduct tests to screen for potential adverse health effects of these emissions.  

Learn more about registered gasoline additives.