I know perfectly well how intersection performance is calculated and if you read what I said properly you would note I said 'for no good reason'. I can and do take intersection departures whenever appropriate. What I said was, if there is no real need to go from an intersection, use the full length. There can be no substitute for more runway in front of you. As you will know, V1 is calculated using perfect scenarios e.g. full braking, very quick reaction times etc.. If all those things don't stack up on the day you reject at high speed, you would be pleased you had used the full length. Even more pleased if you had done intersection performance and gone full length anyway. Again, I was simply making the point to the people who posted about going beyond the piano keys like its forbidden territory.