He started his 11th season as a full-time starter and his seventh consecutive season opener at left guard at San Diego on September 11. He helped the Cowboys offense record 28 points and 301 yards of total offense. He started against the Eagles on October 9, and helped the Cowboys offense record a season-high 456 yards of total offense. His blocking helped protect Drew Bledsoe and allowed him to complete 26-of-37 passes for 312 yards against the Giants on October 16. Allen helped the Cowboys running backs record 164 yards averaging 4.2 yard-per-carry in Seattle on October 23. He helped lead way as Marion Barber III rushed for 127 yards and two touchdowns on 27 carries against the Cardinals on October 30. He was part of an offensive line that allowed Bledsoe time to throw for 332 yards and three touchdowns while the running backs recorded 129 yards and a touchdown against the Kansas City Chiefs on December 11, the 445 yards of total offense was the second-best of the season. His run blocking allowed Julius Jones to rush for 194 yards, the fourth best performance in franchise history in Carolina on Christmas Eve. The Cowboys' offense recorded 22 first downs, 394 total yards, including a season-high 214 rushing, and 24 points in the come-from-behind win. During the Pro Bowl weekend in Honolulu, Hawaii, he won ESPN's "Strongest Man Award" during the Pro Bowl weekend in 2006 by bench pressing 43 reps with 225 pounds.