I think you are still off the mark, gregf83. Partly because you focus on the TTT, which is restricted by its size to a very small group, and is also a short distance. It just doesn't apply to other situations. You are also ignoring the totally wasted effort when you are drifting to the back in a single line. That's huge. It means that it is not more efficient. You are burning watts and not pulling anyone but yourself. You never want to be doing that when maximizing the performance of a group. And why is it that you think a breakaway isn't going as fast as it can? It is going as fast as it can, for the distance it has to cover.