In general, ICEs are very efficient at a constant speed (highway driving) but much less efficient when accelerating and breaking is a net loss of useful energy.

In general, ICEs are very efficient at a constant speed (highway driving) but much less efficient when accelerating and breaking is a net loss of useful energy. EVs have a different sort of performance profile. They're far more efficient at accelerating, they partially regenerate their energy when braking, but they use a lot of energy when cruising at highway speeds.