Interesting to see Andrus rated like that. I would guess the advanced stat at b-r.com that correlates best to Running rating is XBT% (Extra Bases Taken). The percent of times the runner takes more than one base on a single or more than two bases on a double per opportunities to do so.

Some selected AL players in this stat among batting title qualifiers:


Name      Pct
Figgins    66
Aybar      62
Wells      54
Crawford   53
Damon      52
Markakis   48
Granderson 48
Youkilis   45
Andrus     45
ARodriguez 44
Abreu      44
Pedroia    40
Cano       40
AVERAGE    39
Suzuki     38
Jeter      38
Cust       33
Ellsbury   32
Branyan    31
MYoung     30
Kubel      25
Inge       25
Konerko    23
Ordonez    16
Ortiz       8


Based on this, I'd probably have Andrus near the VG/AV line, although not sure on which side he'd fall without looking at more players.