It was also the year of the run. From Coldhardfootballfacts.com
[quote=CHFF]The highest single-season rushing yards per carry average in NFL history is 4.29…set in 2011.[/quote]
Link to story The story is actually about passing, the rushing comment was in the last line.
No deep analysis here just something I saw that I thought was interesting. The one hunch I would have about this is that it's due to Cam Newton and Tim Tebow, or other mobile QBs. QBs are running more and when they do they generally have better YPC than running backs because of broken plays, extra blocker whatever. I have no evidence to back this up, it just a gut feeling for the cause of the higher average.