BuzzBox
How did I calculate the fuel figures?
From the B777 Performance charts for the 777-200ER/TRENT892
Modified for the actual aircraft’s (9M-MRO) OFP (PDA of 1.5% with the right engine burn rate 2% greater than the left engine), altitude, speed, wind, ISA deviation, turning FF adjustment, and bleed air selection.
This resulted in third degree polynomial equations for FF/weight calculations which was used in a 15 page excel spreadsheet to follow the flightpath until fuel exhaustion at 34S 93E.