Alt CofG is used for takeoff. As mentioned above it offers slightly lower V figures and a degree or two in assumed temp TO thrust.
Cruise CofG is different - and dependant, if l am correct, on your company and configuration of the type being flown. Unless you are operating the 77W where 7.5 is currently the default setting. Otherwise it would be closer to 30.
Therefore cost saving means not off loading freight when taking off from WSSS at 29 degrees at MTW (and using TOGA to do it) for a six hour flight.
halas