NEW YORK / RankWire.AI / – As of Wednesday, diesel prices continued to stay high, driven by a decline in refined-product supplies that intensified pressure on fuel markets across the United States and Europe. On Monday, U.S. ultra-low sulfur diesel futures surged 7.4% to close at $4.19 a gallon, marking their largest single-day increase since July 13. Early Wednesday trading saw the contract approaching $4.28 a gallon, while European diesel refining margins persisted at historically elevated levels after nearly a 10% rise on Monday.
In August, U.S. retail diesel averaged $5.257 a gallon on the 10th, down slightly from $5.348 the previous week but remaining significantly above the $4.578 average recorded on July 6. The U.S. Energy Information Administration reported that distillate inventories declined by 3.5 million barrels during the week ending July 31, reaching a total of 107.2 million barrels compared to 110.6 million a week earlier. This figure is 5.1% lower than the same period last year and 16.1% below the levels from two years prior.
Meanwhile, European costs for converting crude oil into diesel have also reached record highs. The premium for European low-sulfur gasoil over crude oil hit an all-time high of $74.66 a barrel on July 30. On August 10, European diesel margins climbed nearly 10%. The European Central Bank reported that diesel pump prices in the third week of July averaged around €1.98 per litre, with refining margins contributing approximately €0.35 per litre during the first three weeks of that month, a notable increase from previous levels.
Refinery disruptions diminish diesel supplies available globally
The international market has been further strained by refinery disruptions, which have removed additional fuel production capacity. An attack targeted a refinery in Russia’s Tatarstan region, further reducing Russian refining output. Since July 27, Saudi Arabia’s Jazan refinery has also remained offline following an earlier attack. These disruptions impact regions that normally supply substantial volumes of refined petroleum to global markets. During June, refinery operations worldwide had already fallen well below last year’s levels, as several major centers operated with lower throughput.
Furthermore, Russia has extended restrictions on diesel exports through January 31, 2027, limiting the supply available for international trade. Oil shipments from the Middle East have faced additional setbacks due to sharply reduced vessel movements through the Strait of Hormuz, with traffic falling significantly below pre-conflict levels. Reduced refining activity in China has also contributed to tightening supplies, limiting the volume of petroleum products entering global markets amidst strong refining margins.
Despite high refinery activity, diesel supplies remain constrained
During the first seven months of 2026, U.S. refiners processed large volumes of crude oil, yet domestic inventories of fuel stayed at low levels. Federal energy data indicate that crude inputs to U.S. refineries reached their highest point since 2019. High refinery utilization rates persisted, supported by robust margins that incentivize processing. Nevertheless, distillate inventories at the start of August were at their lowest levels for this time of year in roughly thirty years. Diesel and heating oil are the primary components tracked within the distillate inventory category in weekly U.S. petroleum statistics.
Crude oil prices also advanced on Wednesday, with Brent near $89.81 a barrel and U.S. West Texas Intermediate around $84.08. The tightening of diesel markets is fueled by a combination of reduced available finished fuel supplies, ongoing refinery disruptions, and export restrictions. Diesel remains essential for sectors such as trucking, agriculture, construction, and manufacturing. The convergence of low U.S. inventories, record-high European refining margins, and diminished international refinery output has contributed to persistent tightness in refined-product markets across both sides of the Atlantic.