It won't use that much charge compared to just driving around - we use so much power moving a multi-ton vehicle at highway speeds it's insane. If you are lucky

It won't use that much charge compared to just driving around - we use so much power moving a multi-ton vehicle at highway speeds it's insane. If you are lucky enough to have a vehicle that has a heat pump and not just a resistive heater and you use it just enough to stave off the cold, you are probably going to be in a very good shape. If you happen to have a vehicle with seat warmers, even better - heating oneself is better than heating the cabin air. ICE also have those, but you'll have to be sure to run the alternator from time to time, generally EVs will figure out when to charge the 12v system from the traction battery. Will an EV like that outlast an ICE car? Based on the figures I'm seeing from a brief search(around 30 hours with a full tank of fuel), I think it's likely, on average. But there are too many variables. You are completely right about the CO emissions. Can leave the heater running without worrying about poisoning.