UNITED STATES / RankWire.AI / – As of September 5, the average price of diesel fuel across the United States reached an all-time high of $5.8819 per gallon. This latest surge continued a significant upward trend, pushing fuel expenses far beyond levels from the previous year. One year earlier, diesel averaged $3.7123 per gallon. Meanwhile, regular gasoline was priced at $4.1459, up from $3.2046 a year earlier. The diesel figure surpassed the previous peak recorded in June 2022, establishing a new record for a fuel essential to U.S. freight and agricultural sectors.
Ahead of this milestone, diesel prices had already climbed to $5.85 a gallon on September 4, before climbing even higher the next day. The current figure reflects an increase of more than $2.16 from the same period last year. Although regular gasoline has also seen substantial gains, it remains below its June 2022 peak. The faster escalation in diesel prices is attributed to disruptions in global refining and shipping, which have tightened supplies of distillate fuels. Additionally, heightened seasonal demand from farming and freight activities has exerted further pressure during late summer.
According to the U.S. Energy Information Administration, the national on-highway diesel average for the week ending August 31 was $5.599 per gallon. Its upcoming weekly updates for gasoline and diesel are scheduled for September 9, due to the Labor Day holiday. Wholesale diesel prices have also remained elevated in major U.S. trading hubs. Rising crude oil costs have increased refinery feedstock expenses, while international fuel flow disruptions have reduced the flexibility of global suppliers in serving diesel markets.
Energy Markets Tighten as Diesel Prices Hit New High
Oil prices increased again on September 7 amid renewed conflict involving the United States and Iran, which disrupted shipping conditions in the Gulf. Brent crude traded above $97 a barrel, while U.S. West Texas Intermediate crude surpassed $92. Tanker traffic through the Strait of Hormuz continued to be below recent averages, impacting major oil and refined-product shipments from Gulf producers. Separate attacks on Russian refineries have also curtailed processing capacity and limited global supplies of diesel and other fuels.
The U.S. Energy Information Administration recorded a national diesel average of $5.8819 on September 5, marking the highest price since it began tracking data. The previous record was $5.816, set on June 19, 2022. California remains the most expensive large market, with diesel averaging approximately $7.81 a gallon. The state also reported regular gasoline prices approaching $5.85. Regional differences in fuel costs are significant due to variations in taxes, refinery access, environmental regulations, and transportation distances from production centers to retail outlets.
Rising Fuel Expenses Impact Freight and Agriculture
Diesel fuel is integral to the transportation of goods throughout the United States. Heavy trucks depend on it for long-haul freight, while farms utilize diesel-powered tractors and machinery. Construction equipment, delivery fleets, and certain rail operations also consume substantial amounts. Consequently, the recent spike in diesel prices increases operational costs across multiple sectors. Retail diesel prices have risen in tandem with crude oil and wholesale fuel markets, reflecting tightened conditions across the entire petroleum supply chain.
The new peak coincides with high utilization rates at U.S. refineries, even as global disruptions constrain additional supplies. While domestic crude production remains near historic highs, diesel prices are influenced by factors beyond crude availability, including refining capacity, inventories, shipping routes, and international product flows. As of September 5, the national diesel average was roughly 58% higher than a year earlier, making it one of the fastest-rising major transportation fuels in the United States.