Comment by nicoburns
19 hours ago
A large amount of the energy of an ICE is wasted as heat and noise. Some of that is a constant factor that isn't sensitive to load. So when increase load, it doesn't make as much of a difference to energy used.
By contract in EVs, much more of the energy is going towards moving the vehicle and therefore both weight and air resistance greatly affect the amount of energy use.
The heat and noise do scale with how much gasoline you burn. That's part of the whole ICE being less efficient than battery in terms of input chemical energy vs output mechanical energy. It cancels out when you're calculating regular vs towing range. The engine is the same efficiency either way.
Oh, it's not the same efficiency either way though, got some good explanations elsewhere