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How to tie a fuel price adjustment to EIA diesel prices, with a 160,000-cubic-yard earthwork example

A fuel price adjustment pays for estimated gallons at the change in a diesel index. This example prices 160,000 cubic yards of earthwork.

6.29 September 2026 · +15.2% on the month · +67.8% on the year

Diesel averaged $6.29 a gallon in September 2026

U.S. on-highway No. 2 diesel retail price, monthly average, dollars per gallon, all taxes included

Diesel averaged $6.29 a gallon in September 2026Line chart with 25 points from September 2024 to September 2026. Series: U.S. on-highway diesel ($/gal). Values range from 3 to 6.345672024-092025-022025-072025-122026-052026-09September 2024: 3.56October 2024: 3.59November 2024: 3.52December 2024: 3.49January 2025: 3.63February 2025: 3.68March 2025: 3.59April 2025: 3.57May 2025: 3.50June 2025: 3.60July 2025: 3.78August 2025: 3.74September 2025: 3.75October 2025: 3.68November 2025: 3.82December 2025: 3.62January 2026: 3.52February 2026: 3.72March 2026: 4.92April 2026: 5.50May 2026: 5.60June 2026: 5.02July 2026: 4.96August 2026: 5.46September 2026: 6.296.29
Diesel averaged $6.29 a gallon in September 2026Line chart with 25 points from September 2024 to September 2026. Series: U.S. on-highway diesel ($/gal). Values range from 3 to 6.345672024-092025-092026-09September 2024: 3.56October 2024: 3.59November 2024: 3.52December 2024: 3.49January 2025: 3.63February 2025: 3.68March 2025: 3.59April 2025: 3.57May 2025: 3.50June 2025: 3.60July 2025: 3.78August 2025: 3.74September 2025: 3.75October 2025: 3.68November 2025: 3.82December 2025: 3.62January 2026: 3.52February 2026: 3.72March 2026: 4.92April 2026: 5.50May 2026: 5.60June 2026: 5.02July 2026: 4.96August 2026: 5.46September 2026: 6.296.29
Nominal dollars. EIA release of October 20, 2026. Source: eia.gov
DateTrendCategoryTitleSummary
DataHow to tie a fuel price adjustment to EIA diesel prices, with a 160,000-cubic-yard earthwork example FeatureA fuel price adjustment pays for estimated gallons at the change in a diesel index. This example prices 160,000 cubic yards of earthwork.
DataHow to price crew vehicle mileage with the IRS rate, which rose to 76 cents a mile in JulyThe IRS business mileage rate is 76 cents for July through December 2026. This example prices a diesel crew truck's miles against $6.29 fuel.
DataHow to compute an hourly rate for owned equipment with the Corps of Engineers method, with a $400,000 excavator exampleA worked example of the Corps of Engineers equipment rate method prices a $400,000 excavator at $93.99 an hour and $21.59 on standby.