Consumption calibration and Test function

[Eric Le Baron]

X5 3.0D 2004
Is there a way to calibrate the indicated consumption?

Used to have a E36 where you could access a kind of hidden test menu to change language, see the battery voltage and more and it gave you the possebility to change a fuel consumption factor.
Believe it was 1000 by default and could be changed to get a more accurate fuel consumption indication.
For example if you use a different wheel size.

Like the display that shows up when you keep pressing the check control button.
It comes up with Test 01 which was the pixel and indicator light test on the E36
Any idea how to activate the tests on the E53?

For some reason the consumption indication I have differs significantly from the actual consumption.
An indication of 7,4 LTR/100KM is more likely to be a real consumption close to 9,5 LTR/100KM....