Originally Posted by Dunbar

Sorry mate, but I think you're wrong. Anyone who can push 300 watts (120% of FTP) for 12 minutes continuously does not have an FTP of 250. Especially if they can do it back to back during an interval session. The first interval I averaged 283w, the second one I averaged 275w. Even using conservative estimates I'd be at 250-260w which means I'm not grossly overestimating FTP. I have access to a lot more of my power data than just these two rides. Normalized power over the course of the ride where I am is useless for determining FTP.

In any event none of this explains why I'm getting winded riding at 100w+ less than these numbers. But I guess we're well past that point...