The national average retail price for on highway diesel fell to $5.210 per gallon in the US Energy Information Administration survey for the week of June 8, 2026, a decline of 14 cents from $5.350 the week before. The drop extends a two week slide that began after the average peaked at $5.523 per gallon on May 25.
Even with the recent declines, diesel remains $1.739 per gallon more expensive than it was a year ago, keeping fuel budgets under pressure across the trucking industry. Industry benchmarking from the American Transportation Research Institute puts fuel at roughly 21 percent of a carrier's total cost per mile, making the weekly EIA survey one of the most closely watched data points in fleet operations.
Regional spreads remain wide. The Gulf Coast posted the lowest average at $4.786 per gallon, while California remained the most expensive market at $6.940. The Midwest recorded the steepest weekly decline, falling 21 cents to $5.182 per gallon. The East Coast averaged $5.149, with New England at $5.626 and the Lower Atlantic at $4.943. The Rocky Mountain region came in at $5.200, and the West Coast excluding California averaged $5.725. EIA collects the data each Monday from a sample of truck stops and service stations across the contiguous United States.
Source: US Energy Information Administration - https://www.eia.gov/dnav/pet/pet_pri_gnd_dcus_nus_w.htm