Well, my D3 was not as smart, but I knew that when the warning light came on I had about 8 litres still in the tank.
Putting 67l in last time meant that there where about 15l left (almost 20%!) - even with the CT on the back that would allow for about 100k...
Just puts a whole lot of more guesswork into the equation, which is disappointing given the increasing sophistication of the systems...

