hi mate,

I cant tell you about the CG trim

However,

Cost index is basically a link to fuel consumtion,

the higher the value, the faster the aircraft climbs, and cruises [ unless you over wright them in the FMC]

A benchmark is around 100-200 i would say, British airways and alot of airlines are down really low atm, becuase of fuel prices!!

BA Use 0 as a cost index for there east bound atlantic flights


HOpe this helps

Alex