NEW YORK / RankWire.AI / – On Wednesday, diesel prices stayed high amid tightening supplies of refined products, exerting upward pressure on fuel markets across the United States and Europe. U.S. ultra-low sulfur diesel futures surged 7.4% on Monday to close at $4.19 a gallon, marking their largest single-day increase since July 13, with early Wednesday trades near $4.28 a gallon. Meanwhile, European diesel refining margins remained at historically elevated levels after nearly a 10% rise on Monday.
As of August 10, U.S. retail diesel averaged $5.257 a gallon, down slightly from $5.348 a week prior but still significantly above the $4.578 average recorded on July 6. The U.S. Energy Information Administration indicated that distillate inventories decreased by 3.5 million barrels for the week ending July 31, bringing stocks to 107.2 million barrels from 110.6 million a week earlier. This total was 5.1% below the same period last year and 16.1% lower than two years ago.
European costs for converting crude oil into diesel have also reached unusual heights, with the premium for low-sulfur gasoil over crude hitting a record $74.66 a barrel on July 30. Diesel margins in Europe increased nearly 10% by August 10, with the European Central Bank reporting diesel pump prices around €1.98 per litre during the third week of July. The analysis showed refining margins contributed about €0.35 per litre in early July, sharply higher than earlier levels.
Refinery Interruptions Cut Diesel Output
Disruptions at refineries have eliminated additional fuel production from a market already constrained globally. An attack targeted a refinery in Russia’s Tatarstan region, adding to the decline in Russian refining activity. Saudi Arabia’s Jazan refinery has also remained offline since July 27 following an earlier attack. These outages impact regions that typically supply substantial volumes of refined petroleum to international markets. During June, global refinery runs had already fallen significantly below year-earlier levels, as key refining centers operated with reduced throughput.
Russia has extended restrictions on diesel exports, limiting the amount available for international trade through January 31, 2027. Additionally, shipment disruptions in the Middle East caused by sharply reduced vessel traffic through the Strait of Hormuz have further hindered supply. Traffic in the strait is well below pre-conflict levels, and China’s reduced refining activity has also limited the volume of petroleum products entering global markets during a period of high refining margins.
Refining Activity Remains High, Yet Market Tightens
Despite significant processing volumes by U.S. refiners, domestic fuel inventories remain at low levels. Federal energy data reveal that crude inputs to U.S. refineries during the first seven months of 2026 reached their highest point since 2019. High margins have supported sustained processing rates, yet distillate inventories at the start of August were at their lowest for this period in about three decades. Diesel and heating oil are the primary components in the weekly U.S. petroleum statistics’ distillate category.
Crude oil prices also increased Wednesday, with Brent trading near $89.81 a barrel and U.S. West Texas Intermediate around $84.08. The diesel market experiences intensified pressure as the supply of finished fuel tightens amid refinery disruptions and export restrictions. Diesel remains crucial for trucking, agriculture, construction, manufacturing, and other commercial sectors. The convergence of low U.S. inventories, record European refining margins, and diminished international refinery output has sustained tightness in refined-product markets across both the Atlantic and Pacific regions.