Current Regulations: See Oklahoma Administrative Code 165:15-7-2 for gasoline and gasohol, and 165:15-7-5 for diesel fuel.
In a multi-state letter dated 8/31/17, to address a fuel supply emergency caused by Hurricane Harvey, EPA allowed 11.5 psi RVP gasoline throughout the state through September 15.
Voluntary: The Tulsa area (including parts of Creek, Rogers, Osage and Wagoner counties) had a voluntary program for max. 7.8 psi RVP for summer regular (87) octane gasoline in 2001- 2012.
Last updated September 2017