Crude oil storage tanks are seen from above at the Cushing oil hub, in Cushing, Oklahoma, in this March 24, 2016 file photo. Oil rallied on Monday, lifted by a wave of investor confidence and a weaker dollar after polls showed a diminishing chance that Britain may vote to leave the European Union later this week. August Brent crude futures were up 90 cents at $50.07 a barrel by 0843 GMT, set for a gain of 6 percent in two trading days. NYMEX crude for July delivery, which expires on Tuesday, was up 80 cents at $48.78 a barrel. Campaigning for Britain’s vote on EU membership resumed on Sunday after a three-day hiatus prompted by the killing of a pro-EU lawmaker. Three opinion polls ahead of Thursday’s vote showed the ‘Remain’ camp recovering some momentum, although the overall picture remained one of an evenly split electorate. Perceived safe havens […]