Tanner Stransky
September 18, 2009 AT 04:31 PM EDT

On the series’ fourth night, NBC’s The Jay Leno Show hit its lowest ratings yet, drawing just 8.5 million viewers in the 10 p.m. timeslot — which is 53 percent down from the show’s Monday premiere and 36 off from Wednesday night’s airing. And for the first time since it premiered, The Jay Leno Show did not win its time period in total viewers — that accolade went to a rerun of CBS’s hot procedural The Mentalist. The first week of Leno has been up and down. Here’s a quick rundown of total viewership so far this week:

Monday: 18.4 million

Tuesday: 11.1 million

Wednesday: 13.4 million

Thursday: 8.5 million

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