Since last Thursday when we got a software update including the latest Supercharger Locations (don't know the version) my morning rated range on our 60 dropped from 186 down to 179. Even if I cut the amps down to 20 and charge to 80% still only get 179. We haven't changed our driving habits and have been pretty steady on our daily use 55 miles, 50% at highway speeds (70mph). So I hope it is not a function of degradation. Car has 5500 miles and is 3 month old.