I wouldn't even know how to work out what group to join based on MPHs, on a flat century (say 3000 feet or less of climbing ) I would be at least 16 mphs, but around my area where I am often doing 100ft climb per mile, my MPH is not compatible with group classifications. A hilly near century (over 7k of climb/94 miles, was 13.4 mph. I only group ride with a ladies shop ride and it really depends on who turns up as to how fast we go and they are rarely speedy rides. I would like to have the balls to join the local club but this fear of classification is what paralyzes me.