Canadian heavy crude’s discount to West Texas Intermediate futures increased to the widest in almost five years, raising the specter of local oil producers curtailing operations. Western Canadian Select’s discount for November fell 65 cents to $41.40 a barrel Wednesday, the biggest since November 2013, data compiled by Bloomberg show. The plunge came as new supply from Suncor Energy Inc.’s Fort Hills mine helps to fill pipelines to capacity. “If you get this sustained wide differential, you are going to see these guys start to ramp down production,” Mike Walls, a Genscape Inc. analyst, said by phone. When discounts widened to $30 a barrel early this year on the back of a pipeline outage, companies including Cenovus Energy Inc. and Canadian Natural Resources Ltd. said they were cutting some production […]