car was more mentally taxing due to all its additional complexity, horsepower, and downforce levels compared to the IndyCar as well as the need to manage fuel levels given that Formula One cars do not refuel during the race while IndyCar racing allows refueling during races. Open-wheel cars "Indy car" is a generic name for championship open-wheel auto racing in the United States. "Indy car" initially described an open-wheel car that participated in the Indianapolis 500-Mile Race. Originally, the cars were generally referred to as "Championship cars". However, as the result of the Indianapolis being the most notable race on the calendar, many people started to apply the "Indy car" designation for the entire American open-wheel class of cars in order to differentiate those from other types of open-wheel cars, such as those used in Formula One. In general, IndyCars of both CART and IndyCar are slower on street and road courses, being less expensive and technology-centric platforms than their Formula One counterparts. This was even the case during the CART PPG era during the mid to late 1990s. With the bid to keep costs down around teams in IndyCar, a competitive Indy car team like Newman/Haas Racing operated on approximately US$20 Million per season, while the McLaren-Mercedes F1 team had an annual budget of US$400 million in 2008. With the budget cap in Formula One which was introduced in 2021, a team now can spend a maximum of US$145 Million on developing their car. The Formula One chassis was required to be built by their respective team/constructor since 1981, whereas an Indy car chassis could be purchased. The dominance of a select few manufacturers has essentially turned the IndyCar Series into a spec series. CART/CCWS became a spec series more intentionally for cost savings purposes. Racing description Indy car racing historically tended to take place on high speed ovals, while Formula One used primarily permanent road courses. However, Champ Car had no oval tracks for the 2007 season (which was its last), while the IRL added road/street courses to what was originally an all-oval series, and IndyCar has had a nearly equal balance of ovals and road/street courses in some years. Currently, the IndyCar Series has fewer ovals on its schedule than road/street courses; the 2021 season had only four oval races, out of 16 overall. Indy car racing was dominated by North American drivers until the 1980s and