Fueled by a double-digit gain in December, AutoNation turned 8 percent more new vehicles in 2014 compared to the previous year.

The largest publicly traded dealer group reported on Tuesday that company franchised dealerships retailed 320,804 new models. The new-vehicle unit sales for AutoNation's operating segments were as follows:

— 97,656 for domestic, up 6 percent versus 2013

— 157,096 for import, up 8 percent versus 2013

— 66,052 for premium luxury, up 13 percent versus 2013

On a same-store basis, AutoNation reported that retail new-vehicle unit sales for the year increased 6 percent year-over-year.

To close 2014, AutoNation store sold 33,069 new vehicles in December, representing an increase of 12 percent year-over-year.

For the month, retail new-vehicle unit sales for AutoNation's operating segments settled as follows:

— 9,497 for domestic, up 11 percent versus last December

— 14,721 for import, up 6 percent versus last December

— 8,851 for premium luxury, up 23 percent versus last December

On a same-store basis, AutoNation’s December new-vehicle unit sales climbed 10 percent compared to the same month a year earlier.

Finally, looking at the fourth-quarter sales chart, AutoNation enjoyed a 9-percent compared to Q4 of 2013, turning 84,968 new vehicles. The breakdown of that figure came in as follows:

— 24,991 for domestic, up 9 percent versus Q4 of 2013

— 39,556 for import, up 8 percent versus Q4 of 2013

— 20,421 for premium luxury, up 12 percent versus Q4 of 2013

On a same-store basis, AutoNation’s Q4 improvement marked a 7-percent jump year-over-year.

AutoNation expects to report January retail new-vehicle unit sales on Feb. 3.