Is it possible to calibrate the fuel computer range calculations.

Asking because today it said that there were diesel for another 60 kilometers but when i filled it up i could only put 48 litres on.

This means that there were 12 liters left and it said that this was equal to 60 kilometers of driving.

And NO ! i dont drive that bad that it only does 5 km's pr liter. (It said that i had done 13,5 kilometers per liter)

So question is....Is it possible to do some sort of calibration to make it more accurate ?

BTW.. The fuel gauge needle had just gone down to the last quarter of the tank.

The fuel computer was enabled when i got it and the GID is the original one.

Xsatquest