I think that one can safely say that the designers of cars have managed to increase their knowlege over time, allowing them to improve their designs over time.
Certainly concluding that both cars and skeletons "evolved" would be erroneous, as at the very least we know full well that it was the intelligent designers of the cars who improved each model, not the cars themselves "evolving"...
Really? These intelligently designed objects improved from their earlier, inferior models? What kind of designer has to improve on her earlier designs? An omniscient one? Or is having to improve on a design evidence of some lesser level of competence?
I think that one can safely say that the designers of cars have managed to increase their knowlege over time, allowing them to improve their designs over time.