With the GPS and all of the onboard computer power, it seems that Tesla could put a routine into our cars to periodically calibrate the speedometer. In every range video I watch, the tester has to set the cruise control a little bit high. For my Model 3, when I go through a radar "trap", I am typically going 2 to 3 mph below indicated. I can do the math, and set things appropriately, But it seems like an easy fix for Tesla.