Habsfan, you will be interested to know that it was Joe Henderson himself who was one of the first to suggest that few marathoners, including elites, can sustain even pace throughout a marathon.
Hal Higdon's book "Marathon" illustrates a formula for maximizing marathon effort. It is based on human performance studies made by George Myers, who furthered Henderson's initial belief that a runner cannot maintain true "even pace" over the 26.2 mile distance.
Below is his formula, along with pace for a 3 hour finish.
Phase 1 - Miles 1 - 12 (3.756% each) 6:46 per mile Phase 2 - Miles 13 - 18 (3.8086% each) 6:51 per mile Phase 3 - Miles 19 - 23 (3.8725% each) 6:58 per mile Phase 4 - Miles 24 - 26 (3.95% each) 7:07 per mile
North, perhaps a graduated pace table like this one may help you next time you go to the line looking for the "right pace".
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