Think you are all missing the point here....
The figures have been taken from Warranty Direct claims,in order to calculate reliabilty.
If WarrantyDirect have only sold extended warranties to 10 Chevrolet owners, but 10,000 Toyota owners, then it goes to reason that the number of claims on Toyotas will exceed that of Chevy.
Ok, my example figures is a bit one way. But knowing that Warranty Direct quoted me nearly £500 per year to provide an extended Warranty on my Captiva, and knowing that most of the car was excluded from that Warranty, I'm not surprised that they sell less Chevy warranties, hence get less claims... thus Chevvy are the top of the tree in their stats.
Saying this. I'm happy with my Captiva, just hope it proves to be reliable... be very happy then.