My Avensis 2.0 GS TD fuel guage is the wackiest fuel guage I've ever seen on a car. The fuel guage slowly moves towards the full level from the halfway mark so that when the journey is complete, I have more fuel in the car than when I turned the ignition on in the first place. I don't know whether it's because it's a diesel and I've never owned a diesel before. Also, when I drive on journeys the fuel guage actually 'fluctuates' depending on whether I am on flat or a slope. Has anyone else noticed this problem?