hi all, new to this. Have a 1987 BMW 735i, auto.( australia) It is reving at 3000rpm at 100 km, or 60 mph. I had gearbox serviced and they said it was all ok, car is driven in econ mode but is still reving way too high, any ideas why this might be. im sure this cant be right, thought it should be reving at around 2000rpm.any help is appreciated