Just to riff further on 2x6/Peter's proposition:

If NASCAR were to go to this formula, you can bet that American auto makers would start making much, much faster sedans (high end, limited production, major $$$). In addition, if they had to use the spare, you can also bet that the spare tires in said high end, pricy machines would be up to the task...

I am the Doctor, and THIS... is my SPOON!