It is recommend to charge most electric cars to 80% in order to preserve the condition of the battery, so this is the most sensible approach whenever possible. In terms of the available range, the manufacturer-provided figures are intended as a guide, and do not necessarily represent the real-world figures which can vary from vehicle to vehicle as well as being affected by factors such as battery age and condition, ambient temperature and vehicle settings. We would always recommend you follow the live information provided by your vehicle as this is the most accurate information available to you, and will also change as the vehicle is driven due to driving style, external temperature and vehicle load.