Living in a state for which Tesla charges for Supercharging based on kWh (California, $0.20), and preparing to take delivery of my new vehicle (after saying goodbye to my S with free supercharging) I have two questions I hope someone with experience paying for Supercharging can answer. 1) Is the rate based on kWh delivered to the car's battery, or used by the chargers? I'm not aware of exactly what the efficiency of a Supercharger is but I assume it isn't 100%. 2) Is the rate taxed, or do you just pay the flat rate, $0.20 * kWh? Thanks!