Cadillac’s 2013 total U.S. sales increased 22 percent, the best total sales year for Cadillac since 2007. December total sales increased 12 percent month over month led by a 20 percent increase in retail sales.

Cadillac was the fastest-growing full-line luxury brand in 2013, an outcome of the brand’s largest expansion since 1976.

“Cadillac saw huge product-driven momentum throughout 2013,” said Bill Peffer, Cadillac vice president of sales and service. “Much of that growth came from buyers new to Cadillac, with Lexus, BMW and Mercedes-Benz being three of the top traded-in brands.”

Cadillac’s new portfolio of sedans total sales improved 48 percent. The award-winning ATS sedan had its best total sales month since its launch, and 72 percent of ATS buyers in December were new to the Cadillac brand.

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Also last month, Cadillac began deliveries of the 2014 CTS Vsport sedan to customers. The rear-wheel-drive CTS Vsport is equipped with the all-new 420-hp Cadillac Twin-Turbo V-6 engine and eight-speed transmission. CTS sales were up 75 percent over November 2013.

Shipments of the 2014 ELR electrified luxury coupe also began in December.