AutoNation Inc. said new auto sales rose 5 percent in May on strong results from domestic and high-priced luxury vehicles. The increase is part of a broader boost for the industry, which saw overall sales rise 2 percent in May to more than 1.64 million cars and trucks, according to Autodata Corp. That marks the fastest pace of growth since July 2005, buoyed by Memorial Day promotions and strong demand for new SUVs.