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 This website is no longer updated and links to external websites and some internal pages may not work.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

Are the min/maxs that are required on the PTD's for RBOB, intended to address the pre-oxygenate blended RBOB or the post-oxygenate blended RBOB?