sentences:  Heading into Week 12, Spiller hadn't gotten as much action as the Bills were planning on because of the Pro Bowl caliber season that Fred Jackson was having, but Jackson was then placed on injured reserve, meaning Spiller would finally get his opportunity and become the Bills' starting running back for the rest of the season.In a Week 16 home game against the Denver Broncos on December 24, 2011, Spiller had the first 100-yard rushing game of his NFL career, rushing 16 times for 111 yards and a touchdown in a 40-14 win for the Bills.Spiller finished the year with 561 yards on 107 carries, with 4 rushing touchdowns and a 5.2 yards/carry average.