25 mph up a hill is fast, but the tour de France is a silly comparison, they sustain those speeds for 4 hours at a time, commuters aren't going to do that. Commuters also rarely face anything resembling the climbs in the tour.
True but on the other side most commuters aren't going for speed, or using great bikes, or proper shoes so I think the expectation would be that the tour de france winner would still average a much faster time than a commuter.
