According to naturalgas.org, in 2002, industrial use was 32% electricity was 24%, residential (mostly home heating) was 22%, commercial was 14% and other was 8%. I assume that commercial has been going down since then as plants have moved offshore. source

I'd be curious what % of industrial is oil refining - I think the % is in double digits, and growing. The tiger eating its tail...does anyone have those stats?

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.

There is good data on prices at this web sit
Right column.

http://tonto.eia.doe.gov/dnav/ng/ng_pri_sum_dcu_nus_m.htm

Here's another useful set of price data:

http://www.oilnergy.com/1gnymex.htm

BTW, given the infrastructure costs of LNG production and delivery, I don't see how it can be landed for less than $7/mmBTU:

http://www.energypulse.net/centers/article/article_display.cfm?a_id=623

redundant and so deleted. Joe