Release: Gasoline and Diesel Fuel Update
Weighted average based on sampling of approximately 900 retail outlets, 8:00AM Monday. The price represents self-service unless only full-service is available and includes all taxes. See (http://www.eia.doe.gov/oil_gas/petroleum/data_publications/wrgp/mogas_home_page.html) for further definitions. Premium Gasoline has an antiknock index (average of the research octane rating and the motor octane number) greater than 90. Octane requirements may vary by altitude.
U.S. Energy Information Administration, US Premium All Formulations Gas Price [GASPRMW], retrieved from FRED, Federal Reserve Bank of St. Louis; https://fred.stlouisfed.org/series/GASPRMW, September 20, 2017.