After weeks of rising prices, diesel and gas prices dropped this week, bringing some relief. The national average on-highway diesel price dropped 3 cents to $3.739, according to data released by the U.S. Energy Information Administration (EIA) on September 16. Gas prices dropped 2 cents to $3.168. What are the current diesel prices across the U.S.? Here are this week’s diesel price highlights from each region of the U.S.: