Guys, it really doesn't matter if it's a plane, bicycle, car, truck, whatever.

The vehicle MUST be moving in order for the treadmill to be moving.

Spinning your tires in one place is NOT moving.

So regardless as to what the speedo says your "speed" is, your actual speed may be different when you're on the treadmill.

Frankly, I do burn outs in my new car all the time. Speedo goes up to about 30 mph. Am I really moving at 30 mph? Hell no. I'm standing on the dyam brake pedal at the moment... The tires are spinning at 30 mph EQUIVALENT, but I'm not actually moving.

Once again, the calculated rotational speed of the tires has nothing to do with the actual motion of the vehicle. If the vehicle is not MOVING forward, the treadmill is not moving. If the vehicle is MOVING forward, the treadmill is moving backwards at the same rate. "Moving" is not spinning your tires in one place. Ever. That's NOT velocity!!

It has nothing to do with "getting the last word in" or anything of that sort. This is a very, very simple physics "problem" that is answered very simply. Assuming you understand WTF "moving" means verses standing still spinning your tires.