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The most efficient runner in NFL history? That depends.

Jamaal Charles is now a Denver Bronco, making him the second superstar running back in two weeks to join a new team at the tail end of his career. In his prime, Charles was a very good receiver and a player that could be the centerpiece of an offense. However, he will likely be remembered for a singular skill: rushing efficiency.

Charles has a career YPC average of 5.45, easily the best in history among running backs in the NFL. That number is at least a little misleading. While rushing efficiency has not soared the way passing efficiency has, we are currently in a high-YPC environment. Two years ago, I calculated era-adjusted yards per carry: at the time, Charles was at 5.49, while the league average was 4.21. For reference, the league average during the careers of Jim Brown, Gale Sayers, and Barry Sanders was 4.08, 3.95, and 3.93, respectively.

I am not a big fan of yards per carry as a statistic, but hey, it’s still interesting trivia. It’s a little silly and mostly an academic exercise, but let’s pretend that we replaced every Charles rush attempt with a league average rush attempt. How much worse off would Kansas City have been? Well, a whole lot. Let’s use his 2010 season as an example. He had 230 carries for 1,467 yards, producing an incredible 6.38 YPC average. The league average that season was 4.21, meaning he was 2.17 YPC above-average. Given his 230 carries, we would have expected him to rush for just 968 yards, meaning he produced 499 rushing yards above average. And for his career? Charles is at +1657.

YearRushYdsYPCLgAvgYPC DiffExp RushYdDiff
2008673575.334.201.1228275
200919011205.894.241.65806314
201023014676.384.212.17968499
201112836.924.292.625231
201228515095.294.261.031215294
201325912874.974.170.801079208
201420610335.014.160.85858175
2015713645.134.131.0029371
201612403.334.19-0.8550-10
Total133272605.454.211.2456031657

I calculated this for all running backs in NFL history. As it turns out, Charles ranks 4th in rushing yards above (YPC-based) expectation:

RkPlayerRushRush YdExpDiffYPCExp YPCDiff
1Barry Sanders3062152691204532244.993.931.05
2Jim Brown235912312963326795.224.081.14
3Joe Perry19299723788718365.044.090.95
4Jamaal Charles13327260560316575.454.211.24
5O.J. Simpson240411236963616004.674.010.67
6Adrian Peterson2418117471014815994.864.20.66
7Walter Payton3838167261532614004.363.990.36
8Tiki Barber221710449909313564.714.10.61
9Fred Taylor2534116951039912964.624.10.51
10Marion Motley8284720343612845.704.151.55
11Eric Dickerson2996132591201012494.434.010.42
12Robert Smith14116818558512334.833.960.87
13James Brooks16857962674112214.7340.72
14Terrell Davis16557607654710604.603.960.64
15Gale Sayers9914956391410425.003.951.05
16Tony Dorsett2936127391171210274.343.990.35
17Wendell Tyler1344637853829964.7540.74
18LeSean McCoy1898895479799754.724.20.51
19Marshall Faulk283612279113139664.333.990.34
20Charlie Garner1537709761689294.624.010.60
21Napoleon Kaufman978479238679254.903.950.95
22Greg Pruitt1196567247509224.743.970.77
23Paul Lowe1026499540939024.873.990.88
24Mercury Morris804413332448895.144.031.11
25Priest Holmes1780817272878854.594.090.50
26Freeman McNeil1798807472028724.494.010.49
27DeAngelo Williams1730809672538434.684.190.49
28Lenny Moore1069517443318434.844.050.79
29Steve Van Buren1320586050348264.443.810.63
30Dan Towler672349326678265.203.971.23
31Emmitt Smith440918355175368194.163.980.19
32Ernie Caddel443231115068055.223.41.82

Charles also ranks “only” 3rd in YPC differential, behind 1930s superstar Ernie Caddel and AAFC superstar Marion Motley. Now in Denver, it seems unlikely that Charles will increase his career YPC average, although he will only need gain yards at an above-average clip to move up the raw differential list. He’s currently 179 yards behind Joe Perry, which means he needs one more season on par with what he did in 2014, or a few less-impressive above-average years.

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