I do wonder how much aero impact that has given the fact that the rider still has to sit on it. Still, minimal gains and all that.
Quite a bit, Trek are claiming the new Madone is 25W better than the outgoing modelat race speeds , and these look substantialy more aero than even those. The average rider’s probably rangeing between 250-400W over most of the race so that’s 10% less effort. Presumably is more evn i the sprint as the wobbling ruins airflow (anyone who’s been sailing in light winds knows that a slight wobble can stall the boat, let alone cav thrashing about) but he’s potentialy 10% fresher than the competition.