US diesel prices hit record $6.31 per gallon, straining farmers and truckers

On Wednesday, September 16, 2026, diesel prices in the United States reached a record high of $6.31 per gallon, according to AAA, amid escalating tensions with Iran. Regular gasoline also rose to $4.37 per gallon. The surge has strained farmers and truckers, who rely on diesel, and has forced families to cut back on expenses. The price increase comes just weeks before the November midterm elections, and Democrats hope to capitalize on voter discontent in farming states. President Trump's approval rating is negative in most of these states, according to Civiqs.