The range on a full charge, in "standard" mode, is estimated at around 70 km (range may vary depending on driving style, route, weight carried and temperatures).
The "Eco" driving mode has been designed to optimise your range with smoother acceleration.
At full speed on the motorway in S mode, the range is significantly lower (about 35-40 km) due to the high power required to drive at 80 km/h.
To increase your range as much as possible, you should avoid stressing the scooter with rapid acceleration. Swap your battery between 20 and 30%.