Range depends on rider's weight, terrain and riding style, 80km range is a theoretical number, experienced riders will have a range between 50 and 60km. If you ride hard you can have a range less than 50km. If you want to compare boards, it's best to compare battery capacity in Wh.
The speed is determined by the gear ratio, the kv of the motor and the battery voltage. The board is designed for a maximum speed of 50km/h. The motors are more than powerful enough to go faster, but we do not recommend changing the gear ratio to adjust the top speed.
About the board
This is a high performance board and not a toy! If you don't have experience with e-boards this is probably not what you are looking for. This is a very heavy board, making it difficult to transport on trains or trams.