The U.S. average diesel price surpassed $6 a gallon for the first time, according to GasBuddy, up nearly 60% since the Iran war began. Supply remains extremely tight, with U.S. diesel inventories 13% below their five-year average, while Brent crude surged to $107.63. Record fuel costs risk reigniting inflation across U.S. supply chains ahead of the midterms.