EDIT: read first post, this idea is basically where it started
well, assuming you have 120v power to the car for charging, you can "preheat" it much more efficiently (energy/money wise) than using battery power and for very little money (like $20, or free if you look around). Just need a small heater w/fan and a timer to start it heating shortly before you go (takes a little planning). Dont burn down your car/house/whatever.
