It won't have 50 miles on it, that's just the default value as everyone has said (and has been asked and answered here over and over again-- search is a wonderful thing). But even if it did, why would that be a problem for you? If it took driving 50 miles to make sure everything was working properly in your car, wouldn't you rather Tesla did that rather than deliver it and hope for the best? Seems like they can't win-- if cars are delivered with problems that appear soon afterwards the owners complain, if cars are driven long enough to make sure problems are fixed then owners complain about that too?