Greg's Dondai Supremo is a used compact car, which first appears in "Beach City Drift". Greg purchased it using a fraction of the ten million dollars from his contract with Marty, as it was a car he had admired greatly in the past.
The car is a 2-door 1980s hatchback. Greg added a sticker on one of the back windows reading "dad on board," which is stuck over the top of another sticker reading "!!USED!!". The car's interior has five seats and a radio.
The car's appearance is likely based on a combination of a 1980s Volkswagen GTI and a 1983–1987 Toyota AE86 Sprinter Trueno. It also bears a resemblance to the 1988 Daihatsu Charade GT-XX. The Dondai Supremo's distinctive style of racing is likely inspired by the Toyota AE86 Sprinter Trueno, featuring Touge drifting as seen in the manga series Initial D.
Greg has admired the car for decades. In Greg's photographs he is seen attempting to share a plate of spaghetti with its grille until the salesman who owned the car stopped him.
Pearl uses it to drive Amethyst, Steven, and herself to Mike Krol's rock show in Ocean Town. She successfully uses it to outrun a police car after running a red light, and also makes use of the car's ability by handbrake drifting into a hidden position behind a billboard. It remained there after it ran out of petrol.