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Reformulated Gas
Reformulated gasoline (known as "RFG") is gas blended to burn cleaner by reducing smog-forming and toxic pollutants in the air we breathe. The Clean Air Act requires that RFG be used in cities with the worst smog pollution to reduce harmful emissions that cause ground-level ozone.
The law also specifies that RFG contain oxygen (2 percent by weight). MTBE (methyl tertiary butyl ether) and ethanol are the two most commonly used substances that add oxygen to gasoline. Oil companies decide which substance to use to meet the law's requirements. Read more about fuel additives.
A state may seek a waiver from the congressional mandate that RFG contain oxygen, but only by providing clear evidence that the oxygen requirement will interfere with the state's ability to meet the national health-based standards or the National Ambient Air Quality Standards. View EPA responses to state waiver requests.
This site contains the following:
Basic Information: Background information about RFG.
Where You Live: Information about RFG in your area.
Regulations & Standards: Rules and support documents dealing with RFG.
Gasoline Properties Data: RFG properties survey data and aggregated gasoline parameter data reported to the EPA.
Guidance: Guidance to fuels industry on implementing RFG requirements.
Reporting Forms: Fuels reporting forms and electronic data exchange.
Registration & Health Effects Testing: EPA regulations require that each manufacturer or importer of gasoline, diesel fuel, or a fuel additive have its product registered prior to its introduction into the nation's fuel supply.
Frequent Questions: Answers to common RFG questions.
Complex Model: (9K ZIP WK3) Computer model used to determine whether gasoline complies with RFG and anti-dumping emissions performance standards. Contact: David Korotney at korotney.david@epa.gov or 734-214-4507.
Related Links: Other sites with RFG information.
Staff contact for RFG issues: Kurt Gustafson at gustafson.kurt@epa.gov or 202-343-9219