What Mileage Can You Realistically Expect From an E-Scooter?

[Nomad]

There is a popular brand of electric scooter in my place, the manufacturer promises 350 kilometers in a single full charge. I haven't used it but the one I use says 160 kilometers. Manufacturers usually claim high range numbers, but real-world usage is different. What range do you actually get on a full charge? Does it change a lot based on speed or load?