I watched an autofocus run last night and noticed the same thing as Jamee. Autofocus completed and I had two green lines that intersected just to the left of the lowest point in the curve. SGP did not put the focus point at the intersection and just put it at the lowest point in the curve. The curve on the right had a lesser slope so I don't know if that made a difference. Other times I notice that it uses the intersection.
I'll run it tonight and save a couple of focus packs.
Chris