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. Its current status is unknown since it was abandoned by the roadside in "Last One Out of Beach City". However, Steven is shown driving it in the opening of Steven Universe Future.
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, a radio, and a tape deck.
Despite its stylised appearance, information revealed about the car in episodes which feature its appearance - notably Beach City Drift - describes it as an amalgamation of several 1980s Japanese compact cars. Its model name and handling reputation derives from the Toyota AE86 Sprinter Trueno, famously featured as Takumi Fujiwara's car in the Initial D manga and anime series. Overall its design can be directly connected to the Mk. I or II Volkswagen Golf GTI, but relevant to the Toyota reference, it's closer to the hatchback body of the AE86's successor, the AE82 Corolla.
Greg associates the Supremo with the 1980s, but Ronaldo recognises Greg's Supremo as a 1996 year model. This may be connected to the Honda EF Civic, the Corolla's main competitor, which was produced into the early 1990s.
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.