At -40 if your ICE car is plugged in, it will start, if it doesn't, a boost will get it going. Do they suffer a mileage penalty, absolutely, but quick swing into a gas station and badabing, badaboom, 5 minutes later, I've got hundreds of more kilometers of range. You cannot sell me on sitting at a charging point like an anxious teenager with their phone on 3% battery waiting for a charger.