Made in America used to mean just that — made in America. Now, everything’s relative. A car that’s mostly made in America qualifies as a domestic vehicle under federal fleet fuel economy standards. Take the Chevrolet Cobalt, which is built at the General Motors Lordstown Complex. It ranked second last week on Cars.com’s latest American-Made Index — up from fourth in January 2007. But the Cobalt is climbing for the wrong reason. According to the Web site, the Cobalt’s domestic content — which is above 80 percent — is holding steady. The problem is that the number of American-made parts in other cars and light trucks is falling. For a long time, the Toyota Camry was the second-most American car, but it dropped out of the second spot six months ago. In fact, it dropped out of the top 10 when its domestic content fell to 68 percent in 2008 compared to 78 percent in 2007. As a result, the Cobalt became the top-ranked passenger car on the American-Made Index.