Can anyone explain me how fuel saving is achieved with such a low number ?
5 kg of fuel is below the FQI system accuracy
If you were to land with 3000 kg of fuel with flaps full, with a flap 3 landing , you would land with 3005 kg.
Now let's say that the next flight requires 6000 kg of fuel. The uplift should be 6000-3005 =2995 kg
And finally after refuelling you end up with 6080 kg . Total uplift was 3075 kg so 80 kg more than expected uplift . After refuelling you never get the exact figure requested.
So where was the fuel saving in this example?