[MitziMoto]

NASCAR fan here.

I think when NASCAR says they are the biggest "spectator" sport they mean that their individual events attract more spectators to one spot than other sports, which for many tracks is absolutely true but misleading. Capacity at Daytona for example is around 150,000 seats which is far more than the highest capacity NFL stadium (Redskins at 82000). With that said, Indianapolis motor speedway has attracted almost 250,000 race fans for the Indy 500, but unfortunately not in recent years.

Anyway, what NASCAR doesn't talk about is that there is only one race going on at one track on any given sunday, and with a few exceptions the sport only comes around once a year. Compare that to the 14+ NFL games that take place in any given week during the regular season and there's really not much of a comparison. The NFL blows them out of the water.