Originally Posted by SabreDriver

From the Boeing Website:
So,

Even if you had a 777-300ER with 365 heavy people in it, say 250# each that would be 91250# plus crew and catering. Still less than 1/2 the load of the Freighter at 229K, so the pax model starts out the equation with 137.7K of extra fuel at the same max gross, how far can your airplane fly on 137K ? One might argue that the fixtures/galleys/seats weigh something, yep they do, but the cargo deck, rollers and doors etc add up too.

Bottom line, the pax model can carry a whole lot of extra gas at the same gross weight, because the payload is so much lighter, as a general rule, your milage may vary...

Have I missed anything here?