Consider your energy sources too, here in ontario my power is coming from a mixture of Hydro and Nuclear. Plugging anything into my car to charge is most defini

Consider your energy sources too, here in ontario my power is coming from a mixture of Hydro and Nuclear. Plugging anything into my car to charge is most definitely worse, as you're then trading relatively clean energy sources for a car engine. If your power comes from a coal/oil plant, it's a rather harder decision, which depends on your vehicles efficiency. However, it's most certainly going to use more fuel (and thus cost you more) than it would take to receive the equivalent electricity.