Both my fuel gauges read full (from full) for a very long time. Then fall rapidly. I've had the low fuel light on my Plus 4 a couple of times. Once I had to drive over 40 miles to find fuel. The second time I filled up just after the light came on and could only get 40 litres in the tank. I rarely go below an indicated quarter tank, and the reading varies a lot between uphill and downhill, and cornering hard.
