Originally Posted by eaglevii
Keep in mind that when a bike club talks about averages, they are talking about actual average speed (or even thier average speed ignoring any slow bits due to traffic). So if you have a computer that starts and stops automatically, that will match thier speed more or less. But if you're taking distance vs. time (which includes lights, stops, etc) that is going to be quite a bit slower than a club ride average.
I disagree (and agree with Al).
When someone says "we average 20-25", that makes no sense. It's an enormous range, too wide to be actual average speed from a computer for a group ride that rides with any kind of consistency.
It's probably the range that covers the speeds they typically see when they look down at their computer when they're going all out.