Global diesel market tightness and record high US prices

By early September 2026, U.S. diesel prices reached a new record high, with national averages hitting $5.85 per gallon on Friday, September 4. This surpasses the previous peak of $5.819 set in June 2022 and represents an approximate 60% increase from the $3.71 average recorded one year prior. In California, prices have climbed even higher to $7.70 per gallon.

The spike is driven by a global supply crunch and geopolitical tensions. The ongoing conflict involving the United States, Israel, and Iran has significantly impacted global fuel flows, specifically raising concerns regarding maritime security in the Strait of Hormuz. This pressure is compounded by rising crude oil costs, with Brent crude trading around $96 per barrel, and Ukrainian drone strikes on Russian refineries. Russia has extended its diesel export ban through September 30, following strikes that have impacted roughly 800,000 barrels of daily supply.

Industry experts from Valero and Phillips 66 noted that geopolitical conflicts have contributed to refinery capacity shutdowns totaling approximately 5 million barrels per day, exacerbating market tightness. As diesel powers approximately 70% of freight, rail, agriculture, and construction, economists warn of increased transportation and logistics expenses. The Independent Grocers Alliance notes that fuel accounts for 15% to 30% of total food costs, meaning consumers will likely face higher prices for perishable goods.

In response, President Donald Trump has announced an oil agreement with Venezuela to develop 17 strategic oil fields with an estimated 65 billion barrels of potential capacity, involving over $100 billion in investment. Additionally, the President has met with refinery executives and energy officials to discuss increasing domestic refining capacity to mitigate consumer costs ahead of the midterm elections.