Why did the BMW 730 in 2002 consume so much fuel?

Hello, the high fuel consumption is generally due to dirty throttle and nozzle ~ insufficient ignition energy of spark plug and ignition coil, insufficient pressure of oil pump, oxygen sensor and carbon deposit in engine. If there is something wrong with your car, I hope my answer can help you. Ask the car master. 4S shop professional technician, 10 minutes to solve.