Part of Henry running 31 times (yes...31 fucking times) and that many yards to run clock and prevent drives by the opposing teams offense. It also helps keep their defense fresh for when they're out there.
The Patriots aren't exactly hurting on the time of possession side of things, they just got 2 field goals, one of them on a 1st and goal from the 1. It's hard to win games when you only put up 13 points.