Detroit manufacturers have desert proving grounds for hot weather. Tesla doesn't seem to have the same for the cold, having just done 'days' of pre-launch testi

Detroit manufacturers have desert proving grounds for hot weather. Tesla doesn't seem to have the same for the cold, having just done 'days' of pre-launch testing in the cold: http://www.teslamotors.com/blog/cold-weather-climate-testing-model-s http://www.teslamotors.com/blog/cold-weather-climate-testing.... Even my parents' Prius, from a long-established manufacturer, runs far less efficiently in Wisconsin winter.