I do not remember the exact miles, but I believe it was approx 20 when I picked up my 2011 factory ordered DRW F350 from the dealer 3 weeks ago.
As of today, I'm already up to about 140 miles!
I, too, had worked for Ford (now retired) and although it has been a number of years, I can still remember seeing trucks being driven out of the factory after final assembly. I'm not an engineer, but a finance guy. However, the way I've seen those trucks being driven at that point in the process was not the what I'd describe as careful driving. ("Gentlemen, start your engines!")