When we land our Gulfstream G650 empty at our home base in Burbank CA, we often like to make the C6 turn off direct into our ramp; if we cross the threshold on glide at 50ft and REF (as opposed to the normal REF + 5) landing on the 1,000 ft markers we can make the turn off which is approximately 3,300 ft from the threshold if we use max reverse and moderate braking.
The AFM says we need approx 2,800 ft unfactored to accomplish this. Now ask yourself this; would you really want to land on a runway equal to the numbers published in the AFM with no margin?