For the most part, offense carries over.
Even with graduation demanding frequent roster turnover, the most dangerous offenses from one year typically remain dangerous the next year, provided they don't lose their coach, change schemes or suffer some sort of recruiting drop-off.
The following list accounts for all four factors. To project next year's top 20 offenses, we looked at how each team performed last season, how many players they return, how they've recruited to replace lost starters and whether they kept constant their schemes.
The 20 teams included are the 20 in which we feel most confident, but any of the 15 honorable mentions, along with countless off-the-radar dark horses, could supplant them next season.
Therein lies one of the great things about college football: Even when you think things carry over, there's always an exception to the rule.
Who saw TCU's offense coming in 2014?