It's significantly cheaper, but it is far from free (unless you are actually not paying for it). Even at a generous $0.10/kWh a Tesla costs about $0.029/mile.

It's significantly cheaper, but it is far from free (unless you are actually not paying for it). Even at a generous $0.10/kWh a Tesla costs about $0.029/mile. At $2.20/gallon, a 30MPG cat costs about $0.073/mile.