cost index for lrc in A320
Hi,just getting a little confused.The A320QRH,in flt performance page 4.11 states that for quick determination of CILRC use 25ci for kgs/min.I would refer to in flt performance LRC in vol3 to extract my speeds in case of a diversion.However there are a lot of pilots insisting that ci0 would give us LRC speeds and some who mention ci15 for diversions at LRC.I understand that the fuel pred fmgs predictions are based on ci0 and fixed levels [220 and 310[depending on the dist to go.So whats the strategy to be followed in case of a diversion at Lrc.And which ci gives us LRC.