I haven't tested in the last couple of months but I'm in the middle of a block of 4x15's. I'm doing these at just below max P/E with limited recovery time between each interval (7-8 minutes) and I'm getting consistent avg watts each interval +/- 3 watts and even picking up an extra 4-5 watts on the fourth effort . Would it be fair to say that the avg numbers I'm getting are close to my FTP?