-
Looking at your Reading splits you were closer to 5mph than 4mph for first 12 miles as hr climbs from 150's upto max of 180. This includes the biggest climb too by looks of profile, tho hr max is after then. There's then big drop off in pace and hr.
The starting speed looks promising for you, as your endurance improves that will indeed knock hours off. For now maybe hold the effort back earlier so it's a steadier sustained pace for longer? Should still allow you some leaway for hitting the cutoffs and be quicker overall?
Now signed on for The Richmond Ultra leg of The Thames Challenge this Sunday (28 Miles).
Cutoff is based on 15min/mile so will have to shift myself a tiny bit faster than Reading (avg 15:49) but I think on a super flat course like this I can power my way through ok.