A potential U.S. diesel export ban is raising concern across global energy markets because U.S. Gulf Coast refineries are major suppliers to international buyers. Any restriction could tighten diesel availability, push prices higher in the United States and abroad, and create particular pressure in Europe, which relies heavily on U.S. supplies. The report also links the prospect of tighter refinery margins and reduced domestic refinery operations to possible upward pressure on crude oil prices. In prediction markets, the chance of crude oil reaching a new all-time high by December 31 has risen slightly to 10.5% from previous days. Market participants are watching for official U.S. announcements, statements from OPEC Secretary General Mohammad Sanusi Barkindo and Saudi Minister of Energy Abdulaziz bin Salman Al Saud, and broader geopolitical and policy developments as the deadline approaches.