I base it on WTI, then subtract out, the differentials to come up with a bitumen price. I don't talk bitumen price on here because too many people wouldn't have a clue. At 78-80 WTI they do get about $50 bitumen, then about $33 netback. One hedge at $78, one at $79.02 until end of April, the rest at market.

Not hard to do but starting point is WTI.