Diesel prices soar to record high of $5.85 as Iran war disrupts fuel supply

In the U.S., diesel prices have reached a record high of $5.85 per gallon as of September 4, 2026. This increase is linked to the ongoing conflict with Iran, which has disrupted fuel supplies since February 2026. The rise in diesel prices is affecting transportation costs, leading to higher prices for various consumer goods, particularly in grocery stores. Businesses are passing these costs onto consumers, raising concerns about the economic impact as the midterm elections approach.