Greetings to all
All figures you can extract from FPPM or equivelant are average figures , Matey is very close , fuel consumption for either or both will differ from given values according to phase of flight and requested flight profile management ,( e.g : flying with both on during high speep climb will result in a lower ROC thus extending the climb segment till hitting the -40 SAT and the opposite during an ECON desend on so on ) best option though is to monitor the FF and you will also have an average close figure nevertheless using the 50 ,150 is an easy good option .
Cheers