The problem with gas cars in cold temperatures has nothing to do with the heater. But quite right, EV technology still needs to improve their range. The amazing thing about EVs on regular roads is they can charge while travelling 60mph, there are several freeways in Europe experimenting with this technology giving EVs virtually unlimited range.... without carrying any extra fuel. That might not ever make it to overlanding vehicles ... or maybe ... like a few other technologies which seemed futuristic 60 years ago....You gonna trust the manufacturer's data (and Elon Musk) over Car and Driver which did an actual driving test and posted the data? Do a web search for how much energy does the heater in an EV use? A gas car uses no additional gas to run the heater as there is plenty of heat available from the hot engine. My Tacoma with FWC camper has a 380 mile range in dry highway conditions and with two jerry cans of gas I get another 190, so there really is no doubt about the superior range over an EV.