I've been researching this for a while, I did find in another forum that someone else had the same problem with a different vehicle and the problem was that the canbus unit doesn't save the settings when it's powered off, the user fixed the problem by supplying a constant 12v to the canbus so it would stay powered while the vehicle is off, not sure how that would affect the battery though. It would be nice though if we could just set imperial to the default somehow, maybe alfaobd would let us override the default configuration somehow. If you do find anything let us know.