There is water lost due to the settled solids and tailings, speaking specifically about mining issues. The way to reduce that water use is by developing what they call dry stackable tailings. So by treating the tailings immediately to produce a dry solid, we recover twice the amount of water, so the actual loss of water is reduced from four barrels to two barrels per barrel of bitumen produced. That's the main technology that's been developed to address surface mining water use.
As for in situ, they're already down around one, in response to my previous question looking at improved water efficiency, solvent-assisted in situ methods, and so on.