For the benefit of SSG
http://www.boeing.com/commercial/air...ps/737sec3.pdf
Page (PDF) 121 = Document 203
Fig 3.3.100
B737800, Winglets, Isa+15 (Brasil), Sea Level, 27.3K engines, NO DERATE
Now run the lines and have a look where the MTOW is for a balanced field 4300ft.
Maybe a smidge over 130K lb using F25.
So the answer is 59T nowhere near 79T MTOW?
130k lb Field Limited MTOW will let you fly the Sao Paulo-Rio De Janeiro sector as Boeing salesman talk...."max payload" ie bums on seats. However you are going to be going no further.
Now using the same figures a 7000ft BFL will give a 77T takeoff and you will go about 2500NM further.
So yes the 737 drivers who tell you they need 7000ft to go anywhere meaningful are correct