I believe its right.
Cyrano,
That doesn't seem right to me either. I don't use KO. I bought the book a long time ago but never used it.
I generated the single deck index for 12 v 6 using CVDATA and it gave me 2, also. Rules I used were 60% penetration, double on 9, 10, and 11 only. No resplitting, no DAS, only one card on Aces splits. It does depend on rules and I don't know what the rules are like in Las Vegas since I've never been there and there are no Single deck games in Indiana. So it seems to me that Vancura and Fuchs got it right.