Hello, Basil
The "K factor" for each flight is on the CFP, therefore available to the Flight Deck crew.
As I cannot make public the documents of my airline, I went on the Net to find some text on the subject and Lo! and Behold! there is one, from the Airbus series of "Getting to grips with..." I found in a Smart Cockpit !
You probably know all the fuel conservation techniques it talks about but the chapter 4.5 deals with "fuel for transportation".
Have a look :
Getting to Grips With Fuel Economy
Click on the screen icon to load.
Best regards.