It was the final season running the IR–05 Dallara spec cars, which had been the series' sole chassis supplier since 2007. It was also the final season running the "Honda Indy V8" naturally-aspirated engines, which had been the series' sole engine supplier since 2006. The events took place in twelve states of the United States, as well Canada, Brazil, and Japan. The schedule featured ten street/road courses and eight on oval tracks. The premier event was the 95th Indianapolis 500, won by Dan Wheldon.