Oil firms on tight supply as U.S. driving season looms
A maze of crude oil pipes and valves is pictured during a tour by the Department of Energy at the Strategic Petroleum Reserve in Freeport, Texas, U.S. June 9, 2016. Reuters /Richard Carson/File Photo By Reuters Oil prices gained on Monday with U.S. fuel demand, tight supply and a slightly weaker U.S. dollar supporting the
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