SONIC® to expand across the U.S. with five new franchise agreements   Five franchise groups acquire existing locations and will build new drive-ins OKLAHOMA CITY, 2017-Jun-14 — /EPR Retail News/ — SONIC® Drive-In (NASDAQ: SONC) today (Jun 13, 2017) announced five new agreements for franchise development in greater Washington, D.C., New York City, the Ohio River Valley, Alabama, Virginia…