The larger an EV is the less efficient it is because it has to carry the unloaded battery with it, and it needs more battery for the same function. I don't have

The larger an EV is the less efficient it is because it has to carry the unloaded battery with it, and it needs more battery for the same function. I don't have the number but I would bet that the energy need is a square of the vehicle weight. It's the same problem rockets have where they have to expend fuel just to carry fuel.