We tested a number of cost index values on specific routes, decided that there wasnt much of a difference between small values, so selected the constant value of 100 for all routes. Goal is to make life easier for crews whilst still saving fuel.
If we had applied the formula correctly for outbound flights, CI values would be around 400. So combined with a fuel tankering policy, the idea is to save cheap outbound fuel to avoid buying foreign fuel.
Mutt.