A simple regression formula was used to determine how many plays a team would be expected to run given their run-pass splits. The teams were then ranked according to the difference between their actual plays and their expected plays.
You would probably expect this watching Iowa's rather methodical pace...Iowa clocks in as the 5th slowest team in the country (the post has a full rundown of all FBS teams). Given Iowa's pass/run split, you would expect the offense to run about 69.3 plays per game. In reality Iowa's average was just 61.6 (FCS games weren't included, i.e. against Eastern Illinois) and Iowa only broke the 69.3 mark three time (against Iowa State, Ball State, and Northwestern). Against Minnesota Iowa didn't even reach 50 offensive plays.
On the flip side, I took a look at the pace of Iowa's opponents and if it changed against Iowa. For the most part it was pretty close...the Hawkeye's opponents averaged 70.2 plays per game against Iowa versus a season averaged of 68.8 plays. In 8 games of 12 games Iowa kept opponents on pace or below with their season average. The glaring exceptions were Michigan, Northwestern, and Missouri who each ran about 10 more plays against Iowa than their average. These three teams really exploited Iowa's bend-but-don't-break cushion on defense and were satisfied moving down the field in small chunks.