Even though gasoline prices have declined nearly 40 cents, Americans are still driving much less than they were last year. This is probably because high gasoline prices aren’t the only things keeping people off of the road. The U.S. Department of Transportation released data recently that shows that since last November, Americans drove nearly 53 billion less than they did in the same period last year. This tops the 1970s’ total decline of 49.3 billion miles. Americans drove 4.7 percent less, or 12.2 billion miles fewer, in June 2008 than June 2007. The decline is most evident in rural...