This is the problem with 'Rankings' It is splitting hairs...
The entire JD Power List is a statistical tie. The winner with .63 problems per vehicle and the last place with 1.3 problems. You cannot have .63 problems with a vehicle you either have problem or not, nor can you have 1.3 problems, they both round to about 1 problem per vehicle.
At he end of the day, for the vehicle you really want, would you care if it had a 63% chance of a problem per vehicle, vs. 1 problem?
What are the problems, that is what really matters.