Agreed. I looked at the wrong column (640i) on attached when I posted the 2012 ratio. Still a ~9% taller ratio for 2013.
The Tu equiped cars must have been demonstrating increased consumption during development so BMW decreased the final drive ratio. Regardless, the 2013s are still faster.
I'm curious how the N63 vs N63Tu equiped 6ers would feel drivability-wise side-by-side given the taller ratio in the latter and the slightly different torque curves. I wonder if any of this is even noticable under normal driving.