UNITED STATES / RankWire.AI / – On September 5, U.S. diesel prices reached a new record of $5.8819 a gallon, continuing a sharp upward trend across the country. A year earlier, the national average was $3.7123 per gallon. Meanwhile, regular gasoline averaged $4.1459, up from $3.2046 during the same period last year. Diesel has now surpassed the previous peak set in June 2022. This surge has pushed fuel expenses to their highest levels on record for truckers, farmers, and other major diesel-dependent industries.
The recent increase followed a national diesel average of $5.85 per gallon on September 4, which had already exceeded the former peak before prices rose again the next day. Currently, diesel costs more than $2.16 per gallon above the same time last year. Although regular gasoline has also increased, its national average remains below the 2022 record. Rising crude oil prices and tighter supplies of refined fuels have been major drivers behind the recent upward movement in U.S. energy markets.
According to AAA, the September 5 national diesel average was $5.8819, exceeding the previous record of $5.816 set on June 19, 2022. California continued to have the highest diesel prices among major markets, with an average close to $7.81 per gallon. Regular gasoline prices in California hovered around $5.85. Regional differences in pump prices persist due to factors such as taxes, refinery access, fuel standards, and transportation costs, leading to significant variations between coastal markets, inland states, and key fuel-producing areas.
Global Fuel Supply Tightening Drives Diesel Price Increase
The U.S. Energy Information Administration reported an on-highway diesel average of $5.599 a gallon for the week ending August 31. Its next weekly update is scheduled for September 9 due to the Labor Day holiday. Wholesale diesel prices have remained elevated at major U.S. trading hubs. Factors such as higher crude costs for refiners and international supply disruptions limiting fuel flows have kept diesel markets tight, even as domestic refineries operate at high capacity utilization rates.
Oil prices also surged on September 7 as tensions involving the United States and Iran disrupted shipping routes through the Gulf. Brent crude traded above $97 a barrel, while West Texas Intermediate moved over $92. Meanwhile, tanker traffic through the Strait of Hormuz remained below recent averages, impacting large volumes of crude oil and refined products from Gulf producers. Attacks on Russian refineries have also diminished processing capacity, intensifying global shortages of diesel and other refined fuels.
Rising Fuel Costs Impact Freight and Agriculture Sectors
Fuel costs are significantly affecting sectors such as freight and agriculture, where diesel remains a vital resource. Long-distance trucks rely on it to transport goods between ports, warehouses, factories, and retail outlets. Farmers depend heavily on diesel for tractors, harvesters, and other heavy machinery. Construction equipment, commercial fleets, and some rail operations also consume substantial amounts of diesel. The recent price increase has consequently led to higher operational expenses across transportation, farming, and construction industries. Due to its widespread industrial use, diesel prices exert a broader economic influence than passenger fuel alone.
Despite U.S. crude production staying near historic highs, diesel prices are influenced by multiple factors across the supply chain. Refining capacity, inventories, shipping routes, and international product movements all play a role in determining the retail price. Disruptions in global refining, combined with seasonal demand from freight and agriculture, have kept supplies tight. As of September 5, the national diesel average was roughly 58% higher than its level from a year earlier, confirming diesel as one of the fastest-rising major transportation fuels in the United States.