Not quite true, the empty weight in MSFS is 19000 lbs and the maximum takeoff weight 28500 lbs.
According to my mentioned source it still reaches 167 kts at 34000 lbs and at 20000 lbs it is 174 kts in 1000 ft. The power setting is 41.4 inches, 2550 rpm (maximum continuous power, 1200 HP).