One of the Phil Steele measures is yards per point, which is a measure of offensive (and conversely defensive) efficiency. To give an example Falcon fans are familiar with, if you go on an 70 yard drive, get into the redzone and then don't score, than you have 70 yards and no points....whereas if you are the kind of team that converts on the end of long drive, then you are going to have a lower yards per point an be a more efficient team.
First, the MAC average is 14.1 (conference games only), which means a team scored a point for every 14 yards they gained. A few thoughts. First, by any measure, there were three elite offensive teams...UT, WMU and NIU. The 4th best team, OU, actually could have even better better, as they were 10th in efficiency. Similarly, CMU seems to have underachieved. On the over achiever side, EMU was actually 10th in scoring and were highly efficient at that. (I think EMU's year last year was badly overrated). Similar, Bowling Green and Kent were actually very efficient but poor scorers.
On the defensive side
Same average, obviously. The goal here is to make your opponents offense inefficient. Western did well here, as did Ball State. The Falcons were 7th in both.