The 2016 Daytona 500 earned a 6.6 final rating (up from its 6.1 overnight) and averaged 11.4 million viewers on FOX, down 14% in ratings and 15% in viewership from last year (7.7, 13.4m) and the second-lowest ever for NASCAR's biggest race since live, flag-to-flag coverage began in 1979, according...