Also depends on speed - for electric cars most economic speed is kinda low, due to atmospheric drag. So in city cycle electric cars will do much much better than gasoline ones.
Ignoring wind resistance is what he wrote, but I think it's the opposite of what he meant. A highway test that accelerates once to a high speed and maintains that speed is mostly about aerodynamic drag.
The battery can store NN kWh and the car weights XX Kg. How many Km can it travel?
It ignores wind resistance, road incline, use of air con, external temperature, number of passengers etc.
So it would even more meaningless than the somewhat synthetic tests already being done.