With Iran blocking the Strait of Hormuz, the United States has quietly become the world's oil safety net — sending record amounts of crude to Asia to replace supplies that can't pass through. It's a strong display of U.S. energy power, and it is helping prevent the crisis from worsening. But there's a complication in the data: a large share of that oil is being drawn directly from the U.S. Strategic Petroleum Reserve, the country's emergency stockpile. The U.S. can continue to plug the gap — but only for a limited time.
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