People ignore the fact that an ICE is also less efficient in winter and that it usually needs to sit stationary with the engine running just to clear the screen, while most EVs can preheat so it’s already warm when you get in.
EV drivers on this thread seem to be reporting a drop in range of between 15 and 30%. Of the last half a dozen ICE cars I’ve had I’d say that the average drop in the coldest months has been around 5% with the worst being 10%. Some difference. Even in these freezing temperatures I’m still getting 550 miles range and on longer journeys it creeps back up towards my normal 600 miles plus. I keep my car in my garage so never need to warm it up or defrost it. I just get in and drive off and I can feel the heat from the seats before I even get to the end of the road, so I don’t think I’d bother with preheating even if I had it!
I loose on average around 5% according to my spreadsheet (petrol) and 5-8% (diesel).
However, you can’t compare ICE with BEV’s easily due to the differencies in their physics and chemical make ups.
Chemical reactions in batteries, occur far more slowly in cold temperatures. Lower temp’s inhibit chemical reactions, and act as increased electrical resistance, which slows down the phsical process, requiring more electricity to perform the same amount of work. On the other hand a fossil fueled car, requires only to reach operating temperature for it to perform at maximum efficiency.
Electric vehicles, have to generate their own heat towarm the cabin. Where as a fossil vehicle uses the excess of waste heat that is generated by the engine to warm the cabin, essentially getting heat “for free. On the other hand, the battery in an EV, is more efficient but, doesn’t generate nearly as much heat, requiring an addidional heater, that leeches extra power from the battery to warm the cabin and in some conditions, battery power must be used to heat the battery itself, to maintain performance or before charging. All of this reduces the amount of available battery power left for actual driving. Vehicles fitted with an heatpump mitigate this, to a certain extent.