The average U.S. retail diesel price fell to $4.96 a gallon in July, down 64.5 cents from last month, according to findings from Magnus Technologies. This was the second consecutive monthly decline, following a surge in the spring that pushed prices to $5.64 a gallon by early April and remained above the $5 threshold for 10 straight weeks.
Despite the July decline, diesel remained 31.14% above July 2025 levels, and included two weeks with the national average above $5 per gallon, bringing the total number of weeks above that threshold in 2026 to 16.
“Falling diesel prices sound positive, but for carriers, a changing fuel market creates risk in both directions,” says Matt Cartwright, founder and CEO of Magnus Technologies. “When fuel prices rise, a surcharge structure that lags can leave carriers absorbing costs they have not recovered, while falling prices can create the opposite problem. The goal is to make sure your surcharge program moves with the market.”
Key takeaways:
· July marked a notable shift in the diesel market, extending a two-month decline after three months of elevated prices. The change is particularly important for carriers whose surcharge programs are based on prior-week or prior-month diesel indexes.
· Recent market developments suggest July's decline should not be viewed as a return to stable fuel costs. U.S. distillate inventories remained below historical averages in mid-July, while global supply disruptions contributed to sharp swings in diesel markets.
