SAN ANTONIO, Dec. 19, 2017 /PRNewswire/ -- Sonic Automotive, Inc. (NYSE listed: SAH, SonicAutomotive.com), a Fortune 300 Company and one of the largest retailers of new & pre-owned vehicles in the United States, announced the expansion of EchoPark Automotive in San Antonio, Texas. Launched in the fall of 2014, EchoPark has been well-received for a revolutionary customer experience in Denver, Colorado providing guests with a whole new way to search for, buy, service and sell their pre-owned vehicles.