I searched on youtube for "M135i xdrive test" and this is the only video I found (with an actual test, the other videos were just video from Paris autoshow presentation of the M135i xdrive)
Mind you, it has 6 minutes of footage, and it's 6 minutes of driving in snow
Where are the real life videos of RWD vs AWD on a race track ?
(not a M135i vs GTR, that is not a fair comparison)
And here is the BMW commercial for Xdrive on M135i:
Mind you, this video is about a "young woman" who is a snowboard champion ("SNOW" again) that wants to be "always in control."
The fact that they use a snowboard girl to market the Xdrive product.. I didn't go to marketing school, but I just use common sense to understand what the target marketing group is then, not ? ...
On BMW website/marketing, Xdrive has a faster 0-62 launch than Sdrive models.
On Porsche website/marketing, a 911 Carrera has a faster 0-62 launch time than the 911 Carrera 4.
Where's the logic ? Or is it just marketing mumbo jumbo after all ?