The rise in availability of TMX volumes in Asia, specifically in China, has affected the US Gulf coast but not in the ways that had been expected. Canadian crude prices and flows into the US have not changed all that much, but the US Gulf coast medium sour markets are certainly now feeling the pinch. Mars exports to China are at an all-time low, weighing on their prices and impacting medium sours that either price against it or compete as an alternative supply into regional refineries.    Key topics covered in the podcast:   Volumes of Canadian crudes coming into the US and impacts on Cushing   Canadian heavy prices at Houston   How medium sours are feeling the pinch from increased Chinese buying of TMX volumes