The maximum speed of a 48V electric scooter depends on several factors such as motor power, rider weight, terrain, and weather conditions.
Assuming an average rider weight of 70-80kg (154-176lbs) and good riding conditions, a 48V electric scooter can typically reach speeds of up to 25-30 km/h (15-18 mph) on flat ground.
However, if the rider is heavier, the terrain is hilly or uneven, or the scooter is ridden against headwinds, the speed may be lower. Additionally, if the scooter has a more powerful motor or is designed for high-speed performance, it may be able to reach higher speeds.
It's important to note that the speed limits for electric scooters may vary depending on local regulations and laws, so it's important to check your local laws and regulations before riding.
KUKIRIN M4 PRO seems like ok, last time I tried it, link: