STEAK ‘N SHAKE TO RETURN AS SPONSOR OF  RAHAL LETTERMAN LANIGAN RACING’S INDY CAR ENTRY IN 2016 Primary sponsorship to span five races, including the 100th Running of the Indy 500 BROWNSBURG, Ind. (December 10, 2015) – Rahal Letterman Lanigan Racing (RLL) announced today that Steak ‘n Shake, a classic American brand and home of…