I'm not sure of the actual numbers and will quickly look it up, but LJ Martin has 127 career carries. 19/127 would be 14.96% and 20/127 would be 15.75%.

It might be more, it might be less....but LJ hasn't had 15.2% go for 10+ yards.  Not possible with 127 carries

EDIT:  Here are LJ's runs of 10+

1. 12 yards vs Sam Houston St
2. 21 yards vs Sam Houston St
3. 12 yards vs Sam Houston St
4. 17 yards vs Southern Utah
5. 45 yards vs Arkansas
6. 10 yards vs Arkansas
7. 13 yards vs Cincy
8. 29 yards vs Cincy
9. 10 yards vs TCU
10. 19 yards vs TCU
11. 14 yards vs TCU
12. 55 yards vs Texas Tech
13. 16 yards vs Texas Tech
14. 10 yards vs Iowa St
15. 12 yards vs Iowa St
16. 10 yards vs Iowa St
17. 17 yards vs Iowa St
18. 10 yards vs SIU
19. 19 yards vs SIU

So that was 17/109 (15.6%) in his freshman year, and 2/18 (11.1%) his sophomore year for an overall result of 15.0%

Tried not including FCS opponents to get to 15.2%, but FBS opponents only has him at 15.5%

Of course, none of this is meaningful or important, but I was just curious where the number was coming from. 

As a side note, Martin exemplifies the all-or-nothing nature of many RBs.  In those 19 carries, he had 351 yards (18.5 ypc).  In his other 108 carries he totalled 254 yards (2.3 ypc).  Martin tends to either get stuffed pretty short...or break a big 10+ yard run (which he does 15% of the time).