Lithia Motors Inc.'s second-quarter profit and revenue soared, largely because of its acquisition last year of DCH Auto Group along with improving new- and used-vehicle sales volumes. Lithia's net income surged 34 percent to $51.2 million in the second quarter from a year earlier, as revenue climbed 63 percent to $2 billion, Lithia, of Medford, Ore., said it was helped by a stronger performance in all areas of the business: new vehicles, used vehicles, parts and service, and finance and insurance.