If there was any BS, then it was from Boeing!
Whether ba operated 767-200ERs or 767-300ERs is nihil ad rem. The point is that they struggle to operate from a 10000 ft balanced field in ISA / still air conditions at MTOW.
Sorry BEagle, but I'm looking at the FAA approved numbers - you know, the numbers that the airlines use. 767-300ER, with RB211-524H engines, MTOW of 415,000 lbs. :
F.A.R. TAKEOFF RUNWAY LENGTH REQUIREMENTS - STANDARD DAY - 9,100 ft.
Make it a +15 deg C day, and it increases to about 9,500 ft.
For the 767-300ER with the more powerful PW4062 engines (which will be on the 767-2C/KE-46), and those field lengths drop to about 8,200 ft. and 8,600 ft., respectively
These numbers are out of FAA approved 767 airplane manuals.
Where did you pull your numbers from?
