Update 2: in Nielsen fast national data the race drew 6.39 million viewers, up 5% from last year and the most viewers since 2011. Nationally (in all 210 markets) the race drew a 4.1 rating, also up 5% versus last year.
The Indianapolis 500 drew a 4.3 overnight household rating, up from last year’s 4.1 overnight rating per ESPN. The race peaked with a 5.7 rating between 3:00-3:15p. Indianapolis was the top local market with a 12.7 rating, up from last year’s 12.4.
Overnight household rating = the live+same day DVR overnight metered-market household rating from the top 56 Nielsen television markets. The 56 markets () account for about 70% of the US TV-viewing population. The overnight household rating is the percentage of the households that were tuned-in in those markets.
Update: ABC initially reported a 4.2 overnight, but it wound up really being a 4.3 (4.27).