A lot of that is camera trickery. The turn out for Indy wasn't very far off the numbers for many of the tracks. Qatar 7,302? Jerez 122,048 Le Mans 82,270 Mugello 80,000 Silverstone 70,123 Assen 97,146 Catalunya 81,426 Sachsenring 98,477 Laguna Seca 51,436 Brno 148,120 Indy 67,794 Aragon 70,124