How to see instantaneous consumption on E90? Help

[chingu]

I have an issue with the consumption only in the city conditions when there are a lot of traffic (idling situation) and I cannot find the root cause.
I was trying to see the instantaneous consumption but DIGITAL_KVA is not available in my COMBI.

Resetting the avg one also is not an option since it won't show anything until you start to move.

Calculations with for example moving 500m and then idling for 5 mins are way too complex and inaccurate so not an option.

I would like to know if there is a way to see the consumption when not moving (displayed in liters/hour) like on most of the cars have it?

I am desperately looking for a solution, if you have an idea please share.

Thanks!