FORT LAUDERDALE, Fla. — AutoNation Inc. reported that new-vehicle unit sales in December 2011 totaled 24,342 units, an increase of 11 percent year over year.

Retail new-vehicle unit sales for AutoNation's domestic segment were up 17 percent (7,609 units), while import sales were flat (11,621 units). Additionally, premium luxury sales were up 32 percent (5,112 units) vs. December 2010.

For the fourth quarter, new-vehicle unit sales increased 12 percent, with domestic up 19 percent, import up 1 percent, and premium luxury up 31 percent year over year. For full year 2011, AutoNation retail new-vehicle unit sales increased 7 percent, with domestic up 17 percent, import flat and premium luxury up 15 percent vs 2010.

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