I understand that a lot of the ML's have problems with the fuel gauge. Something about the gauge not actually registering the amount of fuel in the tank but showing a "calculated" reading. In my ML, when the gauge gets below 1/2 tank, the gauge will vary as much as a 1/4 tank every time I start the car. Does anyone know how to bypass this "calculation" nonsense and make the gauge tell me how much fuel is left in the tank?