Your average car commutes at somewhere between 22 and 24 mph. Even if we assume non-stop 8 hours of driving (which it obviously isn't for mail delivery), that'

Your average car commutes at somewhere between 22 and 24 mph. Even if we assume non-stop 8 hours of driving (which it obviously isn't for mail delivery), that's only ~185 miles of range in the absolute worst case scenario. Well within the range of a modern EV.