RE:how much per barrel?Hope this answers your question and many others. This clip is from the Jan 9/18 news release.
It addresses the concern regarding the WCS price differential and the minimal impact CPG's selling prices.
"Our light oil-weighted asset base continues to generate top-quartile netbacks," said Saxberg. "The recent widening of oil differentials is expected to have a moderate impact on our cash flows of approximately CDN$1.50/bbl in 2018, which has already been offset by the recent increase in WTI prices."