Originally Posted by
Dheorl
I just typed in tour de france average speed into google and it says the winners average speed was 41kph in 2009.
Didn't dispute that. But its not the right measure. That's the total time for the total race, which includes a whole bunch of time where they are not riding very hard at all. It's no indication of how fast those guys actually ride when it maters.
Local Cat 4 road races often have average speeds higher than that.
My point is that if you want to compare the Op's times for his 40 mile solo effort to TDF riders (which is absurd in the first place) the better comparison is to TT speeds, which are substantially above 25 mph.