Here are Gruden's offensive rankings for complete seasons with Tampa Bay. Total numbers are ranking per play. Passing numbers are ranking for total passing yard a game.
total: 26th ypp
passing: 15th ypg
07 is the year with Jeff Garcia if memory serves, a guy who had been taught the position by another coach. Most of the other years were with Gruden hand picking QBs that he couldn't get to perform.
Stats per NFL.com