Natural-gas futures jumped 8% Thursday, their largest one-day percentage gain of this year, after U.S. government data showed a smaller-than-expected weekly climb in inventories of the fuel. Oil futures, meanwhile, fell for a sixth session in a row on the back of growing U.S. crude supplies and a potential slowdown in oil demand. September natural gas rose 21.3 cents, or 8%, to settle at $2.873 per million British thermal units. September crude lost 78 cents, 1.9%, to settle at $41.14 a barrel.
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