Canada oilsands discount to WTI benchmark has narrowed from $40/bbl to $18/bbl due to new pipelines: http://online.wsj.com/news/articles/SB10001424052702303417104579546092181949408 Traders say a gap of about $20 is right, given that WTI is a higher-quality grade of oil and doesn't need to be transported as far to U.S. refineries.