sentences:  If Canadian heavy oil continues to be priced at an attractive discount, refineries are expected to continue to take large volumes despite the light crude oil surplus in the region.PADD 5 (West Coast of the United States) is a large potential market for increasing Canadian oil sands output as production of oil from its historic sources in Alaska and California has declined steeply in recent decades, and it has no pipeline access to new US production in North Dakota or Texas.Imports from countries outside North America have been increasing in volume although most of it is significantly more expensive than Canadian or domestic American oil.