Being stuck in a jam for several hours is a very rare occurrence. In this case, an EV is more efficient than a petrol or diesel car. Think about it – there isn't an engine running unnecessarily wasting energy. OK, turning the heaters or lights on will use some energy, but it'll take a while to run down an EV's battery entirely when it's not moving. You're more likely to run out of petrol or diesel in a combustion-engined vehicle. Electric cars are usually better in cold weather, too – with no gears and instant torque, they'll drive up snowy or icy roads with little fuss, while their skinny eco tyres are also an advantage.