Boeing FMS "step to" prediction
Does anyone know exactly which values are taken by the FMS into consideration when calculating a fuel burn prediction for a "step to" level? CDU shows some savings or penalty but does it account for this short climb phase that we need to go through before reaching a new level?
For example we are 50NM from TOD, maintaining FL340. We put a 360 into "step to" field. The calculation shows 0.3% saving. Does this mean we can expect a total of 0.3% save for the remainder of flight, including 2000ft climb, or is it just a calculation of WHAT WOULD HAVE BEEN SAVED if we had found ourselves at FL360 in this very moment?
Thanks