Upgraded bitumen does not require diluent. It has gone through a process to become synthetic crude oil that had a much higher API gravity. Bitumen has a low API gravity and does not flow easily unless heated. It can be diluted with diluent such as condensate. And condensate is not imported per se. Condensate is C5+ and is extracted from crude oils or natural gas. It can be further refined and used in gasoline. There is also a newer bitumen extraction process called paraffinic froth treatment. Bitumen meets pipeline specifications at the mine and can be processed directly at a refinery without upgrading.

http://www.oilsandsmagazine.com/technical/bitumen-upgrading