I’m currently flying on IF- from OMDB - NZAA in A380 flight level-317 OAT -50 still 8h 44mins to go with fuel remaining 9h 23mins, initially had 2hrs of fuel reserve (with flight time 15h or 15.30 fuel on board 17h)- kind of in doubt if I’m gonna make it to NZAA?. I tried descending to flight level 283 and now its showing me one and half hour extra fuel reserve on board with OAT -30 , I maybe wrong but I guess it has to do with fuel/air consumption ratio, any tips??