I'm guessing but I suspect this gives a 10 year spread on world HL plots.

And you nailed what I am getting at. I think one could scientifically defend something like an HL with a 10 year margin of error. Historically, you could show that this would have worked in the past. My criticism of Deffeyes specifically is that he has taken a tool with 10 year resolution and shouted to everyone that peak was in 2005. Such claims won't be taken seriously, and do much for fostering the "Peak Oilers are crackpots" reputation.

I understand that this doesn't matter to some. But I post here under my real name, and I have a career in the oil industry, so credibility probably has a higher priority to me than it does to the average anonymous poster.

Seems to me that this is basically saying that the precise peak of production doesn't matter but the 'precise' plateau (+- 5 yrs) matters. I believe this to be true as well. Then the question becomes, "Are we on the Peak Oil Plateau?" It looks like we are, so what if we have an upward blip in '07 or '08 that becomes the actual peak. Only thing that would matter would be a sustained increase over the next few years.

Then the question is, "When do we reach the end of the plateau?"