 " Sandwich Day " brought in an average of 5 @.@ 4 million viewers . The episode also achieved a 2 @.@ 6 / 7 in the key 18- to 49 @-@ year @-@ old demographic . The 2 @.@ 6 refers to 2 @.@ 6 % of all 18- to 49 @-@ year @-@ olds in the U.S. , and the 7 refers to 7 % of all 18- to 49 @-@ year @-@ olds watching television at the time of the broadcast in the U.S. 
