Offensively, the top team in the nation on 3rd down has been Purdue. The Boilermakers have converted 21% more 3rd downs than average. Oregon St has had the nation's best 3rd down defense, allowing 19% fewer conversions.
The best team overall on 3rd down has been Texas A&M. Defensively, the Aggies have been among the best at getting to the quarterback for the last few years. This year they have also managed to cover receivers downfield, so their smart defensive 3rd down efficiency has jumped from 83rd to 3rd. On the other end, Arkansas has fallen from 6th to 101st (see "What's wrong with Arkansas?"). This difference in 3rd down efficiency can largely explain the 13.5 point line this weekend for the Texas A&M/Arkansas game.