(Edit: I had to link to the wayback machine because Tesla subsequently removed the press release. Alternately, there's also the blog posting that you yourself pointed to elsewhere in this thread, with the same language: http://www.teslamotors.com/blog/tesla-model-s-achieves-best-...)
The feds pushed back that 5 stars is the max, and there's no such thing as doing better than 5 stars.
