Diesel tops $6.52 nationally as supply tightens

Diesel reached a national average of $6.52 per gallon on Sept. 14, according to the U.S. Energy Information Administration. The price rose 23 cents in one week and was nearly $2.78 higher than during the comparable week in 2025. President Donald Trump has floated restricting diesel exports as the increase spreads through the economy.

The squeeze reaches far beyond filling stations. Trucks, railroads, boats, farms, construction companies, mines and backup-power operators all rely on diesel. Higher fuel bills raise the cost of moving goods, processing food and running equipment. A trucking research firm estimates that a 20% fuel-cost increase can add 4% to operating expenses, and trucking companies commonly pass those costs along.

Supply has been pressured by the near-shutdown of the Strait of Hormuz, refinery disruptions connected to the wars involving Iran and Russia, and Russia’s suspension of diesel exports through at least the end of 2026. The United States makes more diesel than it uses, but domestic producers can earn more by selling abroad. Regional differences are sharp: California’s limited pipeline links and stricter fuel requirements contribute to prices above $8, while the Gulf Coast is at $6.03. Higher diesel costs also affect transit, air travel, generators and heating fuel.