L322 AVG fuel cons readings

Viewed a couple of L322 TD6's and still trying to work out the average fuel consumption computers (pixel one on instrument panel), and the 2 average ones on the TV screen.

Which one is a 'live' reading? And the 2 on the TV screen both had the option to reset them, I reset one of them (cant remember which one) and it seemed to live feed for a short while

Any help greatly appreciated

i think if you reset them both they give a live reading for about 100 miles then that steades out to be the adverige mpg

They don't have a live reading (at least not until the 2010 MY)
All you can do is keep resetting it (any of them) so that the mileage base is kept as low as possible.