In isolation, the power usage doesn't matter much due to the size of the battery, but it adds up to a considerable range hit if each subsystem in the car is not

In isolation, the power usage doesn't matter much due to the size of the battery, but it adds up to a considerable range hit if each subsystem in the car is not reasonably efficient. A mile of range lost per component might not seem like much until 10-20 components are loosing a mile each.