Electric Vehicles

They'd almost certainly still be more efficient.

EVs are 75-80% efficient at using their electrical power.
ICEs are 15-30% efficient at using their chemical power.

Until the battery looses 45% of it's capacity due to cold, it's not even close.

Your coworkers are remotely heating their interiors, so they can be more comfortable as they start driving home.

If they didn't do this, the car would still work but they would have to sit on cold seats, like savages.

Obviously and massively.

Yes, even if the electricity was generated using a gas turbine. Running a gigantic engine at a constant RPM is always going to be more efficient than running a lot of small ones at variable RPMs. You'd have to lose a lot of energy over the wire to cause this to stop being true.

Your range will suffer due to heating the cabin though

Which country is that? I live inn Norway. Remember that ICE cars burn gasoline to heat themselves, winter and summer. Less than half of the gasoline is used for movement.

Also, you don't have to preheat the car. The preheating is for the cabin.

There are plenty of people who remote start ICE vehicles as well.

I don’t know if it’s really warming the battery, but to warm the interior. By the time I get to my car, the cabin, seat, steering wheel are all at a comfortable temperature. The battery works regardless.

Preheating the cabin of an EV must be more efficient than using remote start on an ICE vehicle to pre-heat the cabin.

However for my case, I’ve never used remote start on an ICE vehicle, plus “fuel” for an EV feels so much cheaper and more plentiful and the control is better and I’m not generating air pollution, so I do. It’s probably changing my habits to be more wasteful in return for more comfort

Edit: when my battery is cold, the only difference I see is lack of regen: I have to use my brakes. While I know my battery will also charge slower and have lower capacity, that hasn’t impacted me yet

I was looking into buying an EV recently (northern europe), and the main drawback for me was the distance. ICE can get me 600-700 km onba full tank easy on a highway. Only few EVs can go reliably above 300 in cold weather (say -20C) - and those few cost like 2-3 times more than a brand new ICE. I mainly drive highways and usually over 300km in one go, for moving around the city public transport is good enough (or rental if you need to move large stuff).

More efficient per dollar or per energy unit? Either way, almost certainly EVs will be more efficient than a fossil fuel vehicle dollar for dollar or fuel energy unit.

In most cases yes, but it depends on the car for both EV and ICE. The few areas where ICE wins is when you’re running a super efficient hybrid, but those are few and far between, usually missing some nice luxury features like heated seats and automatically warming up your car before you get in. Things that are very nice for up north.

My sister who lives in Michigan can lose up to 50 miles of range when the weather drops, so she goes from 110 MPGe to around 70 MPGe when the temperature is below 0 (-18c). That’s still more efficient than most ICE but possible to beat.

I don't know exactly, but from what I heard last winter, in a freak cold fronr in the states a some EVs completely died in the middle of their commute. I don't have a source just from my memory.