While many companies within the auto industry might be able to provide a high quantity of used-vehicle advertisements in paid-search results, the quality of many of these used-car ads needs to improve, according to a recent study commissioned by Dealer.com. The “Optimizing Paid Search Advertising – Used Vehicle Market in the U.S.” study, conducted by Sorgenfrei, LLC, evaluated the ads that appeared during search results for the top 10 used models in 10 major markets, including New York, Los Angeles, Chicago, Houston, Philadelphia, San Diego, San Francisco, Columbus, Ohio, Baltimore and Charlotte, N.C.