UNITED STATES / RankWire.AI / – On September 5, the average price of diesel fuel across the U.S. soared to an all-time high of $5.8819 per gallon. This latest surge extends a significant upward trend, pushing fuel costs well above levels from the previous year. One year prior, diesel averaged $3.7123 a gallon. Meanwhile, regular gasoline was at $4.1459, up from $3.2046 a year earlier. The diesel figure surpassed the earlier record set in June 2022, establishing a new peak for a fuel vital to U.S. freight and agriculture sectors.
Diesel prices had already escalated to $5.85 a gallon on September 4, before climbing even higher the following day. The current figure reflects an increase of over $2.16 compared to the same period last year. While gasoline prices have also risen sharply, they remain below their June 2022 peak. The faster rise in diesel prices can be attributed to disruptions in global refining and shipping, which have tightened supplies of distillate fuels. Additionally, intense seasonal demand from farming and freight activities has contributed to upward pressure during late summer.
U.S. Energy Information Administration indicated a national on-highway diesel average of $5.599 per gallon for the week ending August 31. Its upcoming weekly update for gasoline and diesel is scheduled for September 9, owing to the Labor Day holiday. Wholesale diesel prices have also stayed elevated across key U.S. trading hubs. Rising crude oil prices have increased refinery feedstock costs, while international fuel flow disruptions have reduced the flexibility of global suppliers serving diesel markets.
Diesel record persists as energy markets contract
Oil prices climbed 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 moved beyond $92. Tanker traffic through the Strait of Hormuz remained below recent averages. This vital waterway transports major oil and refined product shipments from Gulf producers. Separate attacks on Russian refineries have also curtailed processing capacity and constrained international supplies of diesel and other fuels.
AAA reports that the September 5 diesel average of $5.8819 is the highest recorded national price in its data. The previous diesel peak was $5.816 on June 19, 2022. California continues to be the most expensive major market, with diesel averaging approximately $7.81 a gallon. The state also reported regular gasoline prices near $5.85. Variations in fuel costs are significant across regions, influenced by factors such as taxes, refinery access, environmental rules, and transportation distances from production sites to retail outlets.
Higher fuel costs impact freight and agricultural sectors
Diesel fuels the movement of goods throughout the U.S., underpinning long-distance freight transport with heavy trucks and powering machinery on farms. Construction vehicles, delivery fleets, and some rail services also consume substantial amounts of diesel. As prices increase, operating costs across these sectors are affected. Retail diesel prices have mirrored trends in crude oil and wholesale markets, reflecting tighter conditions throughout the petroleum supply chain.
The record-setting prices come at a time when U.S. refiners operate at near-peak capacity, while global refinery disruptions limit additional supply. Although domestic crude output remains near historic highs, diesel prices are influenced by multiple factors including refining capacity, inventories, shipping routes, and international product flows. As of September 5, the national diesel average was about 58% higher than last year, making it one of the fastest-rising major transportation fuels in the country.