Tips to make it smooth: Ride hard/Power mode/Faster for couple of minutes then you will find smoothness around 40-50 KM/Hr speed. Maintain Tyre pressure once in a week.
Never tried under seat charger. Sound - Diff btw ECO and Power as its states.
Features - External Fuel lid, Spacious, Hooks, Pass Switch, Rear brake look are really useful and convenient.
Mileage - Getting 51 KM/Lit under Half City/Half Highway condition.