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Supercharging cost and charger efficiency

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?

I'm guessing here, but from what I can tell all reporting happens from your car, not the supercharger. So it would actually be "delivered" KW. The new PGE rate tariff for sub-metering of EV chargers allows the owner of the public/private charger to recover costs or even charge overhead (which was not allowed until recently), which is why some locations used to charge per/hour rather than KW. Semantics really.
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