Bob, interesting thread and one which I totally agree with.
What would also be very relevant would be to show the "consistency" in the lower finals.
Personally speaking I normally find that my consistency is very good (when I am on top of the car and the setup), but my raw speed is some way off the top drivers. Most other drivers in my finals at regional/national meetings will have done plenty of single faster laps than me, but I keep up because I can just keep the car rolling around at the same pace.
I would rate myself a good club driver, middling regional driver, and scraping the bottom of the barrel national driver!