May 31, 2013 @ 11:57 am By Tim Kenneally Jay Leno might be on his way out at "The Tonight Show" -- but he's leaving his network a nice parting gift. With numbers in for this year's May sweeps period, Leno's "Tonight" has widened his lead over his competitors David Letterman and Jimmy Kimmel, posting impressive advances over the same period last year. Also read: 'GMA' Beats 'Today' in May Sweeps for First Time in 19 Years During this year's May sweeps, "The Tonight Show With Jay Leno" posted a 39 percent lead over "Late Show With David Letterman" in the advertiser-cherished 18-49 demographic -- the widest May sweep margin over "Late Show" since 2004, and a 12 percent increase over last year's May sweep. "Tonight" averaged 1,075 million viewers in the demographic over the April 25-May 22 sweep period, versus 775,000 for CBS's "Late Show." In total viewers, Leno also widened the lead over Letterman compared to last year, averaging 3.515 million versus 2.767 million for Letterman. That's a 27 percent advantage, up 16 percent from last May. Leno's "Tonight Show" also increased its margins over its ABC competitor "Jimmy Kimmel Live" compared to the two shows' first head-to-head sweep in February, after "Kimmel" moved to 11:35 p.m. During May sweeps, Leno was ahead of "Kimmel" by 30 percent in the demo with 1.075 million viewers versus Kimmel's 826,000, and 42 percent in total viewers, averaging 3.514 million compared to 2,475 for Kimmel. In February, Leno led Kimmel by 12 percent in the demo and 39 percent in total viewers.