Just getting to know my A4 (S line 190 S tronic) since getting it in December and wondered if anyone else has one with the larger 54 litre fuel tank but struggles to get anywhere near that much fuel in it?

For instance, I filled it up from a quarter full and it only took about 35litres, was expecting more like 40 (0.75 x 54) so I thought I'll let it get lower next time.

So I let it get to when the red light comes on and you keep getting messages about being dangerously low on fuel, and can it take you to the nearest fuel station etc. and then I filled it up again. This time it took about 43 litres, so still 11 in the tank presumably!

This seems like the gauge is unnecessarily cautious. Obviously some safety factor is good, as you wouldn't want to run out the moment it indicated empty, and I would never let it get that low in any case,
but it just seems that in order to take advantage of the larger tank you would have to drive with constant low-fuel warning lights on and reminders all the time, which would obviously discourage this.

I was expecting the red light to come on the gauge when there was about 6 litres left, still enough for 50-60 miles, although they would perhaps be tense miles! The other issue with this is the fuel gauge is a digital led segment thing, lovely to look at and all that but not so practical. The segments stay lit for quite a while then a whole chunk goes, unlike with an analogue gauge where you can judge it more precisely and have more of an accurate idea of remaining fuel.

I should point out I am adjusting from a previous B8 A4 with a 63litre tank, and I fairly often do long journeys so a decent range is a must, hence why I wanted the 54litre tank in the new one and not the comedy 40litre!