Car dealers get boost on upgrade, sales By: MarketWatch April 03, 2012 at 13:04 PM EDT Healthy March U.S. sales and upgrade from Buckingham analyst on outlook deliver a boost for major car dealers’ shares. Read More >> Related Stocks: Asbury Automotive Group Inc AutoNation Borg Warner CarMax Ford Motor General Motors Group 1 Automotive Penske Automotive Group Tsakos Energy Navigation Ltd