I ran across this statistical ranking by Phil Steele of all 128 FBS teams based on the combined performances of their offense and defense versus their opponents season averages in total yards gained or allowed (taking out "garbage yards in blowout wins"). Guess who is number 1? (Number 4 coming to town soon, BTW.):
http://www.philsteele.com/Blogs/2015/OCT15/DBOct13.html
http://www.philsteele.com/Blogs/2015/OCT15/DBOct13.html