Seeing as PreNats was 90+, probably not the best thing to compare....
PreNats
North Central: 25:12 average
SUNY Geneseo 25:38 average
Pomona Pitzer 25:43 average
Loras 25:51 average
Wash U 25:52 average
MIT 25:54 average
CNU 25:58 average
Nationals
North Central 24:33 average
SUNY Geneseo 25:20 average
Pomona Pitzer 25:17 average
Loras 25:20 average
Wash U 25:15 average
MIT 25:29 average
CNU 25:01 average
They obviously had the biggest day, but everyone who ran Pre-Nats ran faster at Nationals. Even teams who under-performed at Nationals (MIT, SUNY G)