Western Canadian heavy crude production from tar sands (bitumen) is expected to increase from about 1.7 MMbd/ in 2011 to 2.9 MMbd/d in 2017. Forty percent of that production is mixed with diluent (mostly natural gasoline or condensate) and shipped to the US market by pipeline. As tar sands production increases so does Canadian demand for diluent. That demand already outstrips local production - meaning Canada needs to import increasing volumes of diluent. Today we look at the potential sources of Canadian diluent supplies.