Even without a black box, states that do annual or biannual "safety" inspections are recording this information. Here in NC your annual inspection includes odometer readings (and a check for evidence of odometer tampering) and has for many years. I've always known it was for eventual use as a taxation metric.
So let me guess, they're going to integrate the black box with GPS and every state you drive through is probably going to have a crack at you? Do people yet see why privacy is indeed such a big deal? The concepts of freedom and privacy are inextricably linked, without one you cannot have the other. Technology is making feasible the creation of the Total Surveillance state, once again helpfully enabled by all the people who pooh-poohed privacy concerns over the years, and accused concerned people of being a bunch of Chicken Littles.