This is something that my friends at Roll Bama Roll do every week, and I thought it would be interesting to look at for the Titans as well.  Here is how it works:

Each individual rush is considered on it's own, and measured by it's "success." A run is considered successful if it gets 40% of the yardage needed to move the chains on first down, 60% of the yardage needed on second down, and 100% of the yardage needed on third or fourth down. This is a much more accurate overall picture of how well a running back does in a game than just the total yardage or ypc averages because it ignores big run outliers that can skew those kinds of stats.

Chris Johnson:

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Not an overall successful day for Crazy Legs by this measure, but his cut on the 4th and 1 play that got him in the end zone makes up for all of that. 

*The 13 yard gain on 3rd and 19 probably shouldn't count against him because it was a throw away play.

Now LenDale White:

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Smash had a better percentage success day that CJ.  He was very effective eating clock at the end of the game.

Overall the running backs were 13 of 31 for a 42% success rate.  We will take that against a defense that is as good as Pittsburgh.