The average price of diesel in the United States reached $5.69 per gallon on Wednesday, marking the highest level since the Iran war began, according to AAA data [1]. This represents an increase of 33 cents from the previous month and a 54% jump from September 2025, when the average price was $3.69 per gallon [1]. The rise in diesel prices has outpaced that of unleaded gasoline, which is up about 29% from the same period last year [1].
Analysts attribute the diesel price surge to a combination of global supply bottlenecks and heightened demand, with recent events such as Ukrainian drone strikes on Russian oil refineries playing a significant role [1]. Russia, the world's second-largest exporter of diesel after the U.S., has seen key refineries forced offline, resulting in a substantial reduction in Eastern European diesel exports [1]. U.S. diesel stockpiles in late August fell to seasonal levels not seen since the 1980s, according to the Energy Information Administration (EIA) [1].
As a result of the supply shock and steady global demand, U.S. and Canadian refiners have been able to charge a premium for diesel products, with profit margins for major diesel refiners recently hitting record highs, per the EIA [1]. U.S. refiners have increased their exports of diesel and related fuels by approximately 28% over the past 12 months [1]. Companies such as Valero (VLO) and Marathon (MPC) have benefited significantly, with their share prices rising by more than 45% since mid-June [1].
The White House has taken notice of the situation, with President Donald Trump summoning about a dozen major U.S. oil refiners to Washington to discuss ways to increase refining capacity, including potential regulatory changes, though no specifics were provided [1]. The surge in diesel prices is also impacting the broader economy, as retailers face difficult decisions about whether to absorb higher costs or pass them on to consumers [1].
CONCLUSION
Diesel prices have soared to multi-year highs due to a combination of supply disruptions, particularly from Russian refinery outages, and robust demand. Major U.S. refiners are seeing record profits and share price gains, while policymakers are seeking solutions to expand refining capacity. The ongoing supply constraints and elevated prices are likely to have significant ripple effects across the economy.