We have two VY's and a VZ. "The Vy's are an exec and a Berlina, so we have the basic computer and the luxury level, plus the "troublesome" VZ one.
My Berlina fuel gauge and trip computer work well together and I have not experienced any problems. The VY exec seems to be ok as well. However, I have been driving the VZ a fair bit lately and the fuel gauge and computer seem weird. Get in the car and the computer says 400 km to empty, because the car is parked slightly nose down overnight. Reverse onto the street and start driving and within 1 km, the gauge has dropped into the red and the computer is down to 120 to empty. Bloody needle seems to have a booster rocket on it, the speed it drops.
What I want to know is, what did GM change between the VY and VZ fuel gauges and computers for the VZ to be so inaccurate and inconsistent, or were these problems present in the VY as well? And are the gauges and computers more accurate in the luxury models than the basic ones?