CBS finished No. 1 in the 18-49 demographic for the second time in the last four years which. And, if you attended CBS' upfront presentation last week, you've heard the one about CBS winning the season in overall audience for the eighth consecutive season and 13th time in 14 years, with an average of 10.9 million viewers. Last year, when NBC won the season in the key 18-49 demo thanks to Super Bowl XLIX, CBS suggested removing Super Bowl from the equation, which would…