What is amazing about several comments is the lack of information and understanding  of a few simple facts related to crude oil quality and its processing. The quality i.e composition of crude oils vary and is a significant factor in the economics of crude purchasing and refining.The heavy oil produced in Western Canada contains about 35% material that must be processed in a residue processing unit such as a Coker or Residue Processing unit . The refining capacity in Eastern Canada is about 1.1 million barrels with only about  25000 barrels of Coking/residue processing capacity in Ontario vs about 350,000 barrels in the 1.1 million barrels from the Energy East. Significant capital expenditure will be required by the existing refiners to increase processing of Canadian bitumen derived crude so impact of Energy East pipeline on reducing crude imports will be very limited.