The PGA Tour driving distance average jumped from 289.4 yards to 289.6 yards after the Deutsche Bank event at TPC Boston.
The number of 400-yard plus drives for the season rose from 23 to 24 after Scott Gutschewski hit a 400-yarder on TPC Boston's 9th in round one.
And because it's been a while, if you are wondering why these growing numbers are followed, a full explanation is available here.
The short and sweet version: the USGA stated in 2002 that any significant increases in distance would prompt regulation. The Tour is up 10 yards in that time, a bigger jump than the alarming 1999-2002 increase.