Re: the eyeballed curve vs Deffeyes. Given the contention of pretty well all the technologists that acceleration of production accelerates subsequent depletion, the last 2 points of actual will eventually cause a steeper decline for some time. If one moved the Deffeyes curve to the right a bit, but kept the slope, it might be a better representation. However my own "back of the envelope" analysis gives an all liquids EUR of near 2400 Gb. It makes little difference, as moving the Deffeyes curve a little only moves the mid-point from thanksgiving 2005 to sometime before the end of 2007.
My suspicion is that Deffeyes is using data without NGL, or something like that. His US data is even more off the BP data.