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Story summary
- U.S. diesel prices broke $6 a gallon, the first national average, on Sept. 10, 2026.
- The average rose to $5.98 per gallon, a 61% increase from $3.71 a year earlier.
- Iran-U.S. conflict, Ukrainian drone attacks on Russian refineries, and Russia’s export ban tightened diesel supply.
- U.S. diesel inventories fell to 106.3 million barrels, 13% below the five-year average.
- Five California stations displayed the $9.999 per gallon ceiling, the highest price allowed.
