Hi Skyjob... your quote...
Cost Index (Boeing units) = CostTime [$/h] / CostFuel [ct/lbs]
This seems to be an interesting concept, but can you explain what the CostTime and CostFuel units are? and are they really under the control of the pilots. Surely the Fuel cost is related to the country where the fuel is bought, and the Time cost is dependant upon whether the plane is urgently needed for its next flight.
For instance; It is not uncommon for inbound aircraft to LHR to be asked to slow to Minimum Clean many hundreds of miles out, in order to reduce the number of planes in the stacks, and to decrease the air-pollution over Southern England.