Put a tax black box in your car?

Some states are talking about it.  They want to collect a mileage tax on everyone's car, so they propose to put a tax black box in every car to record (and tax) every mile driven. 
  Dumb idea.  That's what the gasoline tax does.  And every gas station's pumps are set up to collect gas tax already.  There has been some talk about how better gas mileage on new cars has reduced the take from the gas tax.  Malarkey.  What little improvement in mileage is because more of us are driving cheap econo-boxes now instead of decent six passenger sedans.  And, with Great Depression 2.0 still in effect, fewer of us are driving to work anymore. 
   Many have decried the tax black boxes as unwarranted gov'mint snooping on private business.  They suggest that the tax black boxes will be GPS boxes that will report everywhere we drive to.  That's overkill, just recording mileage off the odometer would do the trick as far as the taxman is concerned. 
   And, it's not widely known, but the computer in all new cars records speed, throttle setting, brake application, miles driven, gear selected, and a lot of other stuff that you would just as soon not have fall into the hands of the cops after an accident.  So far only the car companies know how to read this stuff out.  Wait til the ambulance chasers figure it out.