Looking at my car from behind, it is obvious that the rear wheels are not exactly perpendicular to the road surface. The distance between the top of the tires is slightly smaller than at the bottom, and kind of looks like this. /-----\
I've noticed this on a couple of other C-maxes I've seen, so I'm thinking this is by design and not a mechanical issue with my car. Anyone know the reason behind this? Will this impact tire wear? Should the tires be rotated crosswise to extend tire life?