An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Fuels Registration, Reporting, and Compliance Help

The July 1, 1994 Question and Answer Document indicates that sulfur, T90, and olefins are the only simple model RFG standards that can be seen on a refinery aggregated basis. We interpret this clarification to apply only to simple model RFG compliance and