Record diesel prices hit transport stocks, threaten U.S. inflation

U.S. diesel prices reached a record high of $6.51 a gallon on Sunday, according to AAA, triggering a sharp decline in transport stocks and raising concerns about broader inflationary pressure. The national average has increased by more than 40 cents over the past week, a surge that market participants are linking directly to rising costs across freight, food, and consumer goods sectors.

J.B. Hunt Transport Services shares fell more than 13% last Wednesday following a warning from finance chief Brad Delco at a Morgan Stanley industry conference. Delco stated that the company's earnings would decrease between 5% and 10% from the second to the third quarter due to elevated fuel costs. He characterized the current volatility as "some of the most radical and abnormal swings in fuel prices that I think we've ever seen," noting that record diesel costs were creating at least a $10 million headwind for the firm. The Dow Jones Transportation Average dropped more than 2% on the same day.

Data from the Energy Information Administration indicates the national on-highway diesel average was $6.285 a gallon as of September 14, marking a 32-cent increase from the prior week and a $2.55 rise compared to the same period last year. In California, the statewide diesel average stood at $8.039 a gallon as of that date. EIA figures also show that diesel prices have climbed by $2.759 nationally over the past two years.

The price spike stems from two overlapping supply disruptions. Conflict between the U.S. and Iran has restricted tanker traffic through the Strait of Hormuz, reducing crude oil flows and straining refinery output. Additionally, Ukrainian drone strikes on Russian refining infrastructure have compounded these losses. Moscow has banned diesel exports, a significant reduction in supply given Russia's historical role as a major exporter.

Carmit Glik, CEO of Ship4wd, told MarketWatch that diesel costs affect "freight rates, farm equipment, food delivery, and home heating: anything that touches a truck at some point in its journey." The lag between a diesel price surge and its impact on consumer prices typically spans several weeks as fuel surcharges propagate through the logistics chain.

Residential heating costs are also under threat. Mark Wolfe, executive director of the National Energy Assistance Directors Association, warned via CNBC that households reliant on heating oil, particularly in the Northeast, could see bills increase by as much as 31% this winter if diesel prices remain at current levels.

Political responses are emerging in Washington. Iowa Sen. Chuck Grassley urged President Donald Trump over the weekend to impose an embargo on U.S. diesel exports, arguing that current prices are harming farmers and truckers. Senate Majority Leader John Thune told Newsweek he is "open" to examining such a ban. However, Interior Secretary Doug Burgum expressed doubt that an export ban would lower prices, warning it could backfire if trading partners implement their own restrictions.