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Pressure on Iran to end its uranium enrichment program and the falling value of the U.S. dollar may drive prices to $170 a barrel, the president of the Organization of Petroleum Exporting Countries, Chakib Khelil, said Saturday. Oil is headed for its biggest six-month gain since 1999 as investors shun equities for commodities, looking for a hedge against a weaker dollar and quickening inflation. More >>>