Discussion of a potential federal ban on diesel exports led to a widening gap between U.S. and global oil price benchmarks on Friday, Sept. 25, 2026. Market data showed West Texas Intermediate (WTI) crude futures trading as much as $12.02 per barrel under the global Brent benchmark on Thursday, Sept. 24, 2026, the largest such difference since May 6. Analysts stated the price gap indicates expectations that U.S. refineries will process less crude oil if finished diesel cannot be shipped abroad.
The shift in market pricing follows a period of record-high fuel costs, with U.S. diesel hitting $6.528 per gallon earlier this week. While President Donald Trump stated on Tuesday, Sept. 22, 2026, that he supported an export ban, the White House denied reports on Wednesday that it was preparing for a 90-day prohibition. U.S. Energy Secretary Chris Wright said a ban would not bring surging prices under control and has instead contacted executives at major U.S. refiners to gauge support for voluntary export restraints.
U.S. diesel production currently stands at 5.1 million barrels per day (bpd), with net exports of approximately 1.2 million bpd. According to Wood Mackenzie analysts, a ban would redirect a 700,000 bpd oversupply into storage, which would fill Gulf Coast inventories to maximum capacity in roughly one month. Analysts estimated this would force refiners to cut crude runs by more than 2 million bpd, a 12% reduction in U.S. refinery activity at current rates, to prevent inventories from exceeding capacity.
The change for U.S. refiners would be a 12% reduction in crude oil processing within roughly 30 days of a ban taking effect, as Gulf Coast storage hubs reach capacity. For global markets, a U.S. withdrawal would remove the world's largest diesel exporter at a time when supplies from Russia and the Middle East are restricted due to the Iran war and drone attacks on Russian infrastructure. This has already increased shipping costs significantly; for example, chartering a very large crude carrier from the U.S. Gulf Coast to Asia now costs $50 million, up from $16 million before the conflict began.
What happens next: The administration is currently gauging support for voluntary export limits as an alternative to a formal ban. While no specific effective date for a ban has been set, the political pressure regarding fuel costs is linked to the upcoming November midterm elections. The WTI-Brent price spread, which has remained at a discount of at least $4 since July 7, will continue to be monitored as a signal of domestic supply levels and shipping constraints. Further official statements regarding the 90-day ban proposal or voluntary agreements with refiners are expected as the administration seeks to address fuel prices.