Guys I did more testing on top speed of my 5600w electric scooter (Green Road Line) and it stops accelerating at 56 mph... At full throttle the scooter pulls say from 50 mph and stops at 56. I think it's electronically limited in speed as I feel the motor has room to go I know this cause it gets to 56 mph even in slight uphill with good headwind... the only time I was able to get to 57 mph was on a downhill... thought these scooters can go as fast as the motor and voltage allow..
BTW it's stock no modification other than using a lightweight bike seatpost and aero saddle. I ride in a seated position and I weigh 135 lbs. I just wanted to share my experience with the scooter.