The BMW F10 M5 has been shot at the Nürburgring, shown as a “concept,” and has generally been exposed to expectant fans the world over. But even as it was caught prepping for US market duty in Southern California, the name of the game was “look but don’t talk.” We’ve discussed the anti-social tendencies of test mule drivers before, but for some reason it always seems to surprise the folks who come across a mule on the road. On the other hand, if you saw a brand-new M5 on the road with private plates, would you expect the driver to give you the time of day? I thought not.
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