Cybertruck efficiency | Tesla Motors Club So, charged to 100% and immediately departed for a trip Drove 284 miles with 12% remaining, resulting in displayed 364 Wh mi efficiency, but if you divide displayed 103 kWh energy by traveled 284 miles, you get 362 68 Wh mi 12% (14 kWh) remaining results in the car allowing me to use 117 kWh