I mostly charge at my house or office and at both places (according to my utility bill) I am charged $0.18 per kW.
When I'm taking a long trip and I charge at a Tesla Super Charger I'm charged $0.39 per kW.
My car has a 100kWh battery. If I charge from 15% to 85% (that = 70% x 100kWh x cost of electric) or 70 x $.18 = $12.60
If I'm on a long trip using the same parameters and charging at the Tesla Super Charger the cost would be 70 x $0.39 = $27.30
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