Used-car prices continue to sink, extending a trend that began in the spring. Compared to August, average September listing prices for 2011 to 2013 model-year cars were down 1.1 percent ($250) to $22,354. Average prices have now fallen nearly $900 from the beginning of the year.
Practically all the models with the biggest price drops this month were luxury cars, and most of these were BMWs. The brand's 7 Series full-size sedan took the top two spots, with the six-cylinder 740i down 4.7 percent ($2,266) and the V-8 750i down 4.1 percent ($2,113). The lone nonluxury model in the top 10 was the Nissan Leaf electric car, which experienced a 2.9 percent ($531) price drop.