Well, I guess there is little point in arguing further: you're saying a certain thing can't be done, and I'm saying it can.

Again, St. George street in Toronto comes to mind. It goes through the University of Toronto campus, but it is an actual city street (U of T campus is located downtown and is not a little enclosed universe by itself). St. George has a bike lane of each side (~6 feet wide) and a "car" lane (~13 feet wide). A lot of the time there are MANY more cyclists on that street than motorists. The average speed of all traffic on that road is certainly below the posted 25 mph. According to your theory, this would have to mean that cyclists spill all over the road and slow all traffic down to 12 mph or so because the percentage of 25-mph vehicles is so small. But in fact even when there is just one car per ten bicycles, the cyclists stay in the bike lane! Because they've been conditioned to stay out of the way, or even potential way, of cars.

So you're saying they can be taught to leave space for motor vehicles but not for other cyclists? Rather strange conclusion.

Right now, however, the situation is not even as described. There are plenty of vehicles on the road that move at 25 mph and above. However, just because you happen to be in a different class of vehicle you can't go at 25 mph even if you physically could because you're not allowed on the road in some places.

Because the ride isn't really organized. I'm quite serious.

When I participated in a large municipally organized ride this summer (hundreds of cyclist), biking cops had to work hard just to keep the cyclists on the right side of the yellow line because there was a tendency for this huge group to spill over. Does this mean traffic in general is incapable of sticking to the right side of the road or is that the unusual circumstances and the general "you can do anyhing on your bike that won't get you run over" mindset of the average modern North American cyclist?