An actual average of 25mph with warm up and cool down is anyone's definition of an A ride. Our Tuesday night world championships, with about 100 riders, including a spattering of Cat 1's, National champions, and a former Olympian, typically doesn't top 25 mph when you include the entire ride.
Another data point, this weekend's masters race in the Tour of Bahamas averaged 25 mph in the Circuit Race.
That said, average speed doesn't begin to tell the story.
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You could fall off a cliff and die.
You could get lost and die.
You could hit a tree and die.
OR YOU COULD STAY HOME AND FALL OFF THE COUCH AND DIE.