London — They are slowly ploghing their way across thousands of miles of ocean towards America’s Gulf of Mexico coastline. As they do, 12 empty supertankers also reveal a few truths about today’s global oil market. In normal times, the vessels would be filled with heavy, high-sulphur Middle East oil for delivery to refineries in places such as Houston or New Orleans. Not now though. They are sailing cargo-less, a practice that vessel owners normally try to avoid because ships earn money by making deliveries. The 12 vessels are making voyages of as much as 33,800km direct from Asia, all the way around SA, holding nothing but seawater for stability because Middle East producers are restricting supplies. Still, America’s booming volumes of light crude must still be exported, and there aren’t enough supertankers in the Atlantic Ocean for the job. So they’re coming empty. “What’s driving this is a US oil market that’s looking relatively bearish with domestic production estimates trending...

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