I believe it to be entirely possible. And here's why: I believe that those miles were all ridden by professional BMW test riders. Coming from a software development background, I can tell you that it is quite possible to have a whole bunch of professional testers beating the hell out of some code as thoroughly as is humanly imaginable, finding problems and seeing them fixed and then re-testing, only to find that once the software gets out into the hands of users, that new and unexpected problems crop up. We scratch our heads and ask "how in the hell did they manage to make it do that?" etc., but it happens. If nothing else, perhaps the final drives benefited from the extensive testing.