Paul Pfanner on what the next Indy car should be built to prove once raw speed has reached its useful limit. Third in his series on the future of the sport.

Paul Pfanner surveys Sunday's 110th Indianapolis 500 — Felix Rosenqvist's 0.0233-second win for Meyer Shank Racing, the closest finish in race history — and argues that the Penske Entertainment era, reached its best day to date.