From the Super Mario Wiki
The Double-Decker is a kart that appears in Mario Kart Tour, classified as a tour-exclusive High-End kart. Like the name suggests, it resembles a double-decker bus. Dash Panels yield more points when using this kart. It uses the Standard tires. However, the original icon before Version 1.4.1 showed it with the Pipe Frame’s tires.
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