OKLAHOMA CITY, 2016-Apr-14 — /EPR Retail News/ — Sonic Corp. (NASDAQ:SONC), the nation's largest chain of drive-in restaurants, today announced that certain of its subsidiaries have priced $425 million of Series 2016-1 Class A-2 Fixed Rate Senior Secured Notes ("Senior Notes"). The Senior Notes will have an expected life of seven years and bear interest at 4.472%…