"ICE trucks are equally inefficient for towing."

Not so sure about that one, boss. I can fully-load up a Ford Ranger to its 7500lb rated towing capacity and lose ~10% in fuel economy/range while you just dropped something like 30% (from the base power package range of ~240 miles, platinum package at 300 miles you're losing half if you only get 150 miles out.)

You're talking about the difference between towing and not towing per vehicle, not the difference in energy used towing between vehicles.

To get their equal ranges, a Ford Raptor would have a ~4 gallon tank. The fact that the cybertruck can go so far while not towing is the miracle. How far do you think you're going to get with 4 gallons?