My big interrogation now concerns the sentence beginning by "add" : for a consumption at 100% in an extensive utlisation, must we "add" 13 L/pilot/min. to 11 L/pilot/min. (i.e. 24 L/pilot/min. total) or simply "replace" 11 L/pilot/min. by 13 L/pilot/min. ? Because the time available per pilot won't of course be the same...