Originally Posted by
Sidewalk
Or, more likely, whoever has the most energy at the end will just spend more time up front.
This. I recently rode a double with 3 of my friends. Although it was part of an organised ride, after our first stop the big peloton began to thin out massively, and we mostly rode on our own, although we did catch and ride with other groups along the way. The last 1/4 of the ride, myself and one of the others spent most of the time on the front as we were the stronger of the 4.