12 TDs as a Freshman 166 carries and 802 yards
Soph: 217 for 1260
Jr: injury shortened
Sr: 234 for 1408
I don't think his running ability improved a lot. He mainly got bigger and stronger, but be could flat-out play from day 1.
Players in the team knew he was the best back on the team immediately and were a bit puzzled at why he wasn't getting more touches.