NEW YORK / RankWire.AI / – Persistent pressures on diesel markets persisted on Wednesday, driven by dwindling inventories and refinery outages that have constricted fuel availability in both the United States and Europe. U.S. ultra-low sulfur diesel futures experienced a significant jump of 7.4% on Monday, reaching $4.19 a gallon. This marked the most substantial single-day rise for the contract since July 13. Early Wednesday, prices hovered near $4.28. Meanwhile, European diesel refining margins also remained high, having increased nearly 10% at the beginning of the week.
The latest official weekly data revealed a sharp decline in U.S. distillate inventories. According to the U.S. Energy Information Administration, stocks totaled 107.2 million barrels for the week ending July 31, reflecting a decrease of 3.5 million barrels from the previous week. These inventories were 5.1% below the levels recorded a year earlier and 16.1% beneath the comparable period in 2024. This category includes diesel and heating oil, making it a key indicator of available middle-distillate supplies within the domestic fuel market.
Despite slight easing from the previous week, retail diesel prices remained high. On August 10, the national average stood at $5.257 a gallon, down from $5.348 one week prior. However, this was still well above the $4.578 average noted on July 6. Similar market pressures have affected Europe. The premium for low-sulfur gasoil over crude oil hit a record $74.66 a barrel on July 30, illustrating the sharp rise in diesel’s value relative to crude oil.
Refinery outages hinder global product flows
The reduction in diesel and other fuel supplies available for international trade is largely due to refinery shutdowns. An attack damaged a refinery in Russia’s Tatarstan region, further lowering Russian processing capacity. Additionally, Saudi Arabia’s Jazan refinery has remained offline since July 27 following an earlier attack, removing additional refined-product capacity from the market. In June, global refinery utilization rates were already below those of the previous year, affected by lower processing activity across several key fuel-producing regions.
Export restrictions have also contributed to the tightening. Russia extended restrictions on gasoline and diesel exports through January 31, 2027. Vessel traffic through the Strait of Hormuz, a critical route for petroleum shipments, has slowed in the Middle East. Meanwhile, China has supplied fewer refined products amid weakening domestic refinery activity. The European Central Bank reported diesel pump prices near €1.98 per litre during the third week of July, with refining margins comprising a much larger share of retail costs.
High refinery throughput cannot restore US stockpiles
Although U.S. refiners processed large volumes of crude oil, distillate inventories remain at historically low levels. Crude inputs during the first seven months of 2026 hit their highest point since 2019 for that period. However, despite strong refinery utilization, diesel stocks have not returned to typical seasonal levels. At the start of August, inventories were at their lowest for this time of year in nearly thirty years. This tight stock situation coincides with reduced international product flows and ongoing refinery disruptions.
Oil prices also increased on Wednesday, with Brent crude approaching $89.81 a barrel and West Texas Intermediate reaching around $84.08. Diesel continues to face more significant pressure because supplies of finished fuel remain constrained in several major markets. The fuel is extensively used in trucking, agriculture, construction, and manufacturing sectors. The combination of low U.S. inventories, elevated European refining margins, refinery outages, and export limits has kept diesel markets tight across both regions as buyers compete for limited supplies of refined product.