Why don&#x27;t electric cars come with a tiny kerosene cabin heater as standard?  A small heater would take up little space or weight, could be easily refueled at home so not need a detour to a petrol station, and be much more cost effective than adding extra batteries just to provide cabin heat.  Sure, it&#x27;s not zero-emission, but the efficiency of a kerosene heater can be pretty good (much better than an internal combustion engine) and it might go a long way to increase the usefulness on cold days.