Electric Vehicle Energy Efficiency Converter EV Energy Efficiency Converter Energy Efficiency From Unit Miles per kWh (mi/kWh) Kilometers per kWh (km/kWh) Watt-hours per Mile (Wh/mi) Watt-hours per Kilometer (Wh/km) To Unit Miles per kWh (mi/kWh) Kilometers per kWh (km/kWh) Watt-hours per Mile (Wh/mi) Watt-hours per Kilometer (Wh/km) Convert Efficiency