fuel planning 747/340

[Mikey21]

Just wondering what rule rule of thumbs do you use for fuel planning on the heavy.
I realise that it depends on many parameters, but I am just looking for a approximate number.
is it in the 3 tons/h par engine? just guessing,

anyone knows ? what about the 340,

how much fuel would you carry on a 15h flight?

thanks for your info.

I am also trying to answer that question:
if 1.8 Epr produce 60 000 lbs of thrust, would 1.8 epr produce the same thrust, let's say after 5 years of engine usuage??