CBS’ MacGyver is on a demo ratings yo-yo. After dropping -0.3 (-25%) last week to a season low 0.9 in adults 18-49 (Live+same day), the action procedural (1.1) remade most of the ground last night, up +22%. The show did it while shedding old viewers because its total viewership, 7.01 million, was actually down from last week’s 7.31 million to a new low.