Yes, it's test 20 and it says KVBR with a value of 1000.
To get this test 20 and some others you have to enter the unlock code which is the sum of the numbers in test 1: FGSTNR LV12345
In this emample the code would be 15.
How to calculate the KVBR?
I've seen the formula some years ago for an E36 so it should be somewhere on the web....

Just found this 1 for an E34: new_correction_factor = old_correction_factor * actual_mpg / obc_mpg