Not trying to make a big deal about this, but I believe the defense "getting tired" argument is overplayed (it's one of the things I strongly disagree with CPJ about).
Syracuse has the highest number of drives per game this year, yet their FEI is 36. It is only one data point, which makes it anecdotal, but it does add evidence that having more drives does't not necessarily mean you give up more points per drive.
Drive data from:
https://public.tableau.com/shared/PPKNK9XG7?:display_count=no
Syracuse
14.8 drives per game - rank 1
23% of drives touch down - rank 39
0.385 Points per play - rank 67
36 overall FEI def
Oklahoma
11.455 drives per game - rank 104 (Oklahoma actually does
not have a lot of possessions)
36% of drives touch down - rank 110
0.431 Points per play - rank 83
94 overall FEI def
GT
10.9 drives per game - rank 121
36.9% of drives touch down - rank 114
0.487 Points per play - rank 111
106 overall FEI def