That's because that mustang dyno measured only the rear motor, which is the same as the one in the P85 as you said.I explained it in more detail in your "85D 691HP should have an asterisk * next to it.. "Up to 691HP" thread, but you must have missed it.Edit:The P85 has been measured over 2000 pound-foot, which is obviously wrong, and so is the 874 figure.They likely didn't account for gear ratio correctly, like on many EVs.