In Pixar's Cars 2, what is the name of the race series featuring events in three countries?

In Pixar's Cars 2, the World Grand Prix is the race series featuring events in three countries.

The competition is organized by Miles Axlerod to promote Allinol, an alternative fuel. Its races take place in Tokyo, Porto Corso, and London, bringing Lightning McQueen and Mater into an international adventure. The series also provides cover for a conspiracy involving modified race cars and attacks on competitors.

The Piston Cup is the domestic stock-car championship associated with Lightning's career in the first and third films. It is not the name of the international series in Cars 2. The World Grand Prix is sometimes shortened in discussion to WGP, but its full canonical name is World Grand Prix.