Look around you on race day. Those who are busy turning their heads and looking for their competition in the first few miles are too stressed. Those are the folks who aren’t going to have a good day.
Karl Meltzer, winner of 34 100-mile races, reminding us to put pressure on ourselves later in the race, only after we’ve settled into a nice rhythm (in the same article he states that the “race doesn’t really start until mile 70”.) .