From Tesla's original post: "For his first recharge, he charged the car to 90%. During the second Supercharge, despite almost running out of energy on the prior leg, he deliberately stopped charging at 72%."

And the graph of battery levels shows what level he recharged to. http://www.teslamotors.com/blog/most-peculiar-test-drive

If he had charged to 100% for that last Supercharge - I wonder if the result would have been different.