Ahhhhh the paceline!
A paceline is the most efficient way for a group to move at speed through the wind and is achieved by having one line of fast riders 'pulling' through and another adjacent line of slow riders 'drifting' back to rejoin the faster line. This rotation effectively allows the slower group to rest while they drift back, regain composure, and rejoin the fast group to re-exert themselves. This results in consistent speed at a shared output. Think team time trial. The larger the numbers, the more evenly split the work is amongst the participants, however, the easier the paceline is to get disorganized, or for tired or less committed riders to hide and not share in the workload.
The BASIC steps to establish a paceline are as follows:
Those are the basics. With a little practice and training it is easy to save 30% energy over the peloton versus riding alone in the wind!