Experience points are determined based on more than one factor, namely the distance, the number of your trips, and how well you follow the usage rules. The more you take longer trips and make sure to tie the scooter to a pole or tree and leave it in a safe place, the more your experience points increase, and your speed gradually improves. On the other hand, not following the usage rules and leaving the scooter in unsafe places or without tying it down exposes you to a speed reduction.