Actually, you can, its still stupid to do that, thas like me weighing myself with all my clothes on. but whatever i guess
So your car comes with a remote control does it? There are lots of ways car companies measure weights of cars none is more stupid than the other...... what do you think is a fair measure? Just the weight of the car without fuel, oil and other liquids? Maybe with fluids and fuel..... but nearly empty or a full tank can make a difference of 50kg..... or maybe the other option which is including the weight of an average driver...... another option is including all optional extras..... all different but none are stupid.
Also when you last went to the doctor and they measured your weight I bet they didn't ask you to strip off LOL if they did you'd better change doctors!