Boks claims a 2007 kill rate of 45%.
Before Boks in 2005, the kill rate was 56.9%.
Under Boks the first year in 2006, it climbed .1% to 57%.
If you add the 2% died in shelter rates for both years, the real kill rate was 59%.
The sample of Mason's cats was 65%.
I think it safe to say the real kill rate is 60% or better.