With the final numbers in, Jay Leno's last Tonight Show performed even better than overnight ratings implied. A whopping 14.6 million viewers watched the Thursday episode, making it Leno's biggest audience in more than 15 years. As for the last time Leno approached such highs, that was back in May of 1998 when he hosted an exclusive post-finale sit-down with Seinfeld star Jerry Seinfeld. That episode brought in 15 million viewers. It seems goodbyes are good for business.