What is the name of the annual race series in the Cars universe?

What is the name of the annual race series in the Cars universe? It is the Piston Cup.

The Piston Cup is the championship competition that defines professional stock-car racing in the Cars universe. Lightning McQueen enters its season as a rookie in the first film, competing against established racers such as Chick Hicks and Strip “The King” Weathers.

Strictly speaking, the competition is often called the Piston Cup Racing Series, while the Piston Cup itself is also the trophy awarded for winning a season. In ordinary Cars dialogue and quiz usage, however, “Piston Cup” is the established short name for the series and its championship. That makes the stored answer the fair canonical response.

The series is modeled broadly on American stock-car racing, especially NASCAR-style oval competition. The first film’s climactic events revolve around a three-way championship finish and show how Lightning’s priorities change from winning at any cost to valuing friendship, sportsmanship, and Doc Hudson’s legacy.