U.S. diesel prices climbed to a record $6.06 per gallon on September 11, as fuel supply disruptions tied to the wars in Iran and Ukraine pushed transportation costs higher across the economy.
The figure surpasses all previous highs for the fuel, which powers trucking, freight rail, agriculture, and much of the country’s shipping network. Diesel’s rise feeds directly into the cost of moving goods, adding pressure to consumer prices already strained by months of energy volatility.
The latest increase follows a pattern of supply squeezes tied to conflict in the Middle East. Fighting involving Iran has repeatedly threatened flows through the Strait of Hormuz, the shipping channel through which a large share of the world’s crude and refined products passes.
Russia’s war in Ukraine has compounded the strain. Disruptions to Russian refining capacity and the reordering of global fuel trade have tightened diesel markets in particular, leaving distillate inventories thin heading into autumn.
Diesel typically carries a premium over gasoline during periods of supply stress because refineries cannot quickly shift output between the two fuels. The record price reflects both reduced supply and steady industrial demand.
The current spike extends a trend seen earlier this year, when refinery outages helped drive diesel to earlier highs and lifted crude benchmarks. Brent and West Texas Intermediate have traded at elevated levels through much of the conflict.
Higher diesel costs ripple through the wider economy. Freight operators pass fuel surcharges to shippers, who in turn raise prices on food, retail goods, and construction materials. The effect lands hardest on sectors dependent on long-haul trucking.
Analysts have warned that any further disruption to Hormuz shipping could push distillate prices higher still, given already tight global inventories.
Traders will watch weekly U.S. inventory data and developments in both conflict zones for the next signal on where diesel prices head.