Interesting, there may be multiple taxes, state sales, county or city, if so I would expect the composite value to be stated.That's what I'm getting at. If the Supercharger was billing $0.59/kWh pre-tax, once you add tax it would give you a higher effective cost per kWh.
This invoice from charging in Iowa came in with a whopping 16% tax (even though it claims only 9.6%). I was charged $0.31/kWh for the energy, but the effective rate was $0.36/kWh.
My Tesla app based charging test last April at a brand new station shows accurate Mass sales tax only.
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