I spent <5 minutes on google this evening and found these two nuggets that might help the scientists @mitaerobike, @chrisyuinc, and also @jim_gourley / @rappstar over on twitter do some helmet claim math...
5 hr flat stage power and speed:
5 hr climbing stage power and speed:
...and new information in the mix is that the Specialized crew is now claiming only 20W over their road helmet at 30 mph while being tested on a mannequin in isolation in a wind tunnel (as I understand things):
based on the new bits of information above, what are your estimates for watt savings during a 5hr tour stage?