Models are ordered according to YTD September sales. Base model specs are presented for each model. Purchase price may vary state-by-state due to variations in local taxes and fees. Efficiency is measured in watt-hours per km (Wh/km). This represents how much electricity a vehicle uses to travel one kilometre. WLTP is the Worldwide Harmonised Light Vehicle Test Procedure. It is a laboratory test used to measure fuel consumption and vehicle emissions.