Diesel prices are displayed above $8 per gallon at a gas station in Los Angeles, on September 17, 2026, as prices reach record highs across the United States. Average diesel prices in the United States struck a record high of just under $6.27 a gallon on September 15, the motorists' association AAA said, pressuring President Donald Trump ahead of midterm congressional elections. The price of the fuel used largely in road hauling, agriculture and construction hit $6.2694, according to the association, as the Middle East war tightens supplies and Ukraine strikes Russian refineries. (Photo by Frederic J. BROWN / AFP via Getty Images)