the Mustang taking a 33 percent hit compared to 2006

There's been a spate of vehicles given the roofless treatment since 2003, which helped keep registrations of convertibles growing since then. 2007 saw the trend reverse, though, with registrations of droptops sliding by 8.6 percent, says R.L. Polk & Company. Polk's folks contend that while there's now plenty of selection with fancy retractable hardtops, the economic slide is putting downward