Observations

Aug 2026: 4.909

Updated: Sep 1, 2026 9:03 AM CDT

Units:

Dollars per Gallon,

Not Seasonally Adjusted

Frequency:

Monthly,

End of Month

Notes

Title	Release Dates

PADD IV (Rocky Mountain District) Premium All Formulations Gas Price	2009-09-28	2026-09-01

Source

U.S. Energy Information Administration	2009-09-28	2026-09-01

Release

Weekly Retail Gasoline and Diesel Prices	2009-09-28	2013-01-21
Gasoline and Diesel Fuel Update	2013-01-22	2026-09-01

Units

Dollars per Gallon	2009-09-28	2026-09-01

Frequency

Monthly, End of Month	2009-09-28	2026-09-01

Seasonal Adjustment

Not Seasonally Adjusted	2009-09-28	2026-09-01

Notes

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. PADD IV (Petroleum Administration for Defense District) represents the Rocky Mountain District and includes the following states: Colorado, Idaho, Montana, Utah, and Wyoming.	2009-09-28	2026-09-01

PADD IV (Rocky Mountain District) Premium All Formulations Gas Price (GASPRMRMM)