Maybe some do, but in this part of the country the brakes on my truck last the summer before they start to pulsate(from rust).

And my friend who has a late model stock car uses standard auto parts full sized chevy rotor (cause that's the rules), they glow red in corners, and last a season, when they're worn out.

Normalized on a per-vehicle basis.

Which means precisely...... what?

For example, 1 warranty request per 100 vehicles, or $100 in warranty cost per vehicle, etc.

If Ford sold half as many cars, and said their warranty claims on new cars decreased by 25%, that doesn't mean their quality is improving since the rate of warranty claims/vehicle is increasing.

Gotcha. Sometimes a post requires more than a sentence to explain something, ya know ;)

Warranty is measured in cost per unit, so it doesn't really matter other than the more vehicles in the populace usually means lower cost per unit.