Going Postal, how far can you go in an hour?

I've never done a one hour "Postal" racewalk, heck I've never competed in any racewalking event, but I have seen one. See this post for some photos of a Postal race.

The distance is measured in meters but to satisfy my curiosity I decided to calculate the paces of last year's Southern Cal Walkers Postals.

Contestant                 Age  Distance         Average Pace
Chris Rael          Male   47   10,680 meters     9:02 min/mi
Pedro Santoni       Male   49   10,673 meters     9:03 min/mi
Rick Campbell       Male   60   10,214 meters     9:27 min/mi
Donna Cunningham    Female 59    9,852 meters     9:48 min/mi
Ray Billig          Male   49    9,441 meters    10:14 min/mi
Alan Ede            Male   67    9,361 meters    10:19 min/mi
Jolene Steigerwalt  Female 63    9,223 meters    10:28 min/mi
Carl Acosta         Male   72    9,195 meters    10:30 min/mi
Bob Nyman           Male   67    9,084 meters    10:38 min/mi
Carol Bertino       Female 59    8,879 meters    10:53 min/mi
Bill Moremen        Male   78    8,789 meters    10:59 min/mi
Leon Glazman        Male   72    8,457 meters    11:25 min/mi
Arvid Rolle         Male   72    8,451 meters    11:26 min/mi
Shirley Capps       Female 71    8,415 meters    11:28 min/mi
Roberta Hatfield    Female 65    8,273 meters    11:40 min/mi
Nancy Alexander     Female 66    8,226 meters    11:44 min/mi
Ellis Jones         Male   62    8,100 meters    11:55 min/mi
Joan McIntyre       Female 70    7,881 meters    12:15 min/mi
Anelise Smith       Female 67    7,774 meters    12:25 min/mi
M.J. Sullivan       Female 64    7,433 meters    12:59 min/mi
Patti Kennedy       Female 76    7,382 meters    13:05 min/mi
Margaret Fields     Female 63    7,345 meters    13:09 min/mi
Jenny Dean          Female 55    7,211 meters    13:23 min/mi
Bigalita Egger      Female 65    7,136 meters    13:32 min/mi
Grace Moremen       Female 75    7,081 meters    13:38 min/mi
M. Noritake         Male   82    6,970 meters    13:51 min/mi
Soula Thomas        Female 82    6,875 meters    14:03 min/mi
Pat Willis          Female 70    6,538 meters    14:46 min/mi

I'm impressed. If I am to compete in my age group I should be doing much better than 12 min/mi for a six-mile walk. Looks like I'm going to have to push up the pace for the morning workouts.