Or if we extend the boundaries to all of North America, how much Nat Gas is being used in the Oil Sands?

The question goes a lot deeper than the volume for the tar sands. That volume is increasing, Canada's NG production is in serious nationwide depletion and expansion of the tar sands development is continuing, and through all that, Canada has a commitment under NAFTA to export at least some minimum volume. I would expect their export volume to wane with no serious reaction from the US since the perception is that we need their oil from the tar sands more than we need their gas.