I did a lot of checking and emailing and phone calling to Popular Mechanics. The April 2008 issue carried an article about Challenger. I would have to go back to be sure, but I think the print article 4/08 is different from this one, and two others on the Popular Mechanics web page. The three linked together on the web page are dated 2/08 and center around the Chicago auto show. The eventual reply from Popular Mechanics editorial service is that only 4/08 carried a print article, the others are online versions only.

Steve