Pump prices · week of September 21, 2026
Diesel and regular gasoline prices in US Rocky Mountain
In the week of September 21, 2026, diesel averaged $6.34 a gallon in US Rocky Mountain and regular gasoline $4.51 (US$1.68 a litre for diesel). Diesel is +72% and regular gasoline +69% compared with the week of February 23, 2026, before the Strait of Hormuz closed.
Updated September 21, 2026 · Source: US EIA weekly retail gasoline and diesel prices
| This week | Week ago | Week of February 23, 2026 | Change since then | |
|---|---|---|---|---|
| Regular gasoline ($/gal) | 4.510 | 4.438 | 2.662 | +69.4% |
| Diesel ($/gal) | 6.340 | 6.066 | 3.683 | +72.1% |
Trend
■ Diesel ■ regular gasoline, weekly, in $/gal.
Common questions
How much is diesel in US Rocky Mountain?
$6.34 a gallon on average in the week of September 21, 2026 (US$1.68 a litre), according to the US EIA weekly retail gasoline and diesel prices.
How much has fuel risen in US Rocky Mountain since February 2026?
Diesel: +72%. Regular gasoline: +69%. Compared with the week of February 23, 2026.
How does US Rocky Mountain compare with the US average?
Diesel in US Rocky Mountain is $6.34 against $6.53 for the United States.
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