Moreno was named the SEC's Freshman Offensive Player of the Year for 2007 by The Sporting News, and was an All-SEC first team selection by the AP and SEC Coaches. Moreno ranks No. 2 on Georgia's all-time list and No. 4 on the SEC's all-time list for most yards rushing by a freshman.
Moreno was expected to be a candidate for the Heisman Trophy in 2008, but he got off to a slow start. He was held under 100 yards in three of his first five games, including a loss to Alabama in which he was held to 34 yards, the second-lowest total of his career. Moreno bounced back by running for at least 100 yards in five of his next six games, but was held to 65 yards in a loss to Florida, Georgia's second loss of the season. Moreno finished the regular season with nearly identical stats to his freshman year. He had 1,338 rushing yards and 16 touchdowns.
In 2008, Moreno was a finalist for the Doak Walker Award but finished second in the voting to Shonn Greene of Iowa. He was also one of 15 semifinalists for the Maxwell Award.
Moreno split time in the backfield with Correll Buckhalter, scoring his first career touchdown in Week 3 against Oakland. Moreno finished his rookie season with 947 rushing yards and seven rushing touchdowns in 16 games.