1 litre of petrol contain about 8.79 KWHr (30023 BTU) of energy. A car wieghs about 1500Kg is able to run for about 10000 meters by burning 1 litre of petorl. For moving 1500 Kgs for 10000 meters the energy required is 150 Megajoules which is equal to 41.67 KWHr. How this is possible? Am I missing something? Please help me.