yes ....the CFP's are pretty accurate ....
what i know ...there is no limit for how much extra fuel you can uplift...if all the TOW and the LW are not governing ...
so extra fuel uplift is a matter of knowledge and information ....because i remember recently ...i was flying with one of the Tr.capts ...and the departure and destination weather were bad...so he asked me to decide on the total fuel....so i said i want to tanker more 500 kgs...then he said (why exactly 500 ?) why not 1000 or even more...so i said i just need more fuel but infact i don't know how much more should i take...then he said " son ...in these kind of situations where bad weather is in the departure and arrivale airport...the minimum extra fuel you should think of is a 30 min holding fuel" ...and at that flight according to the CFP the 30 min fuel was 1100KGS...
by the way....i am flying the A320...does any one here have the latest AIRBUS flight crew training manual (FCTM) the latest revision...the one i have were written in may 1998...there must be a newer version...looking forward to have it.
thanks