Frequent Questions

Do products such as fuel economy devices or fuel additives that claim to improve fuel economy or lower emissions really work? Some claim to be EPA-certified.

Under the Clean Air Act all fuel additives must be registered with EPA. EPA also has a program which tests aftermarket devices and certain fuel additives. EPA, however, does not certify, approve, or endorse any of these products. In fact, EPA testing has not found that any of them significantly benefit fuel economy or reduce exhaust emissions.

For more information:

For more information about gasoline standards and registered gasoline additives:

For further questions, you may contact the EPA Fuels Program:

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