Media versions of Boeing 777 performance
I refrained from posting on the main thread because it is too crowded there.
There are two simple reasons to this and both have already been mentioned in the main thread:
1, ZBAA is very busy and extra holding fuel does not harm. One of the most useless things in aviation is the fuel you did not uplift (the others being the runway behind you and the altitude above you).
2. Fuel at ZBAA is generally cheaper than Malaysia so why not tanker to save a few bob for the company.
My 2 cents.