Hmm. I think there must be a LOT of variation in shoe sizes, because that chart does not work at all for me.
I wear a W39 across the board (Sprints, KSOs, and Treks), and am an 8.5 (right foot) and a 9 (left foot) in women's shoes.
Many people in the exact opposite situation as well based on the other thread that this was in. As I said this is just meant as a guide. Every shoe company does sizes differently. Best way is to measure the foot. If you think this is a more accurate US shoe size to inch chart point me to it and I can put it here.