On the Boeing Customer 1 (C1) flight, you will demonstrate that the plane you are about to buy RTO's correctly. Normally from 100-110 kts depending on the Boeing test pilot. Doing my first C1 with a real nice old boy (30 yrs in test flight) I asked him if I should leave the parking brake OFF after taxi in having rejected at Boeing Field at 110kts, new brakes (steel CAT C) smoking like mad. 'Boy, there's no energy in those brakes.' Is what he said. LWT was around 50 tons, 15 tons below MLWT. That was a nice calibration ride, the fuse plugs were miles away from going, but perhaps the next RTO, 20 mins later, Field Length Limited would be exciting!