I have ,lets say, 200 miles showing on the display and this will equate on the fuel gauge between half and three quarters showing.
Now if i am driving casually, say 80'ish on the motorway the reading will stay the same. If i accelerate/go quicker it will go down, but if i get back down to 80 or slower it will go back up, even telling me i have more than the 200.....
I also notice that the DIS reading seems to correct itself after turning the engine/ignition off. I can use the car on a 20 minute journey and the fuel reading will not go down that much. However when starting the car up again it can be upto 50 miles lower.....
On my RS2, the fuel display on the DIS would show you how many miles you had left in the tank and, like the S4, it would go down, and go down quickly if you "drove" it, but it would never go up. If you put it on ave MPG it would return around 22, but when giving it any would go down to 6 or 7.....
Or does it sound as though something is faulty?