From Sonic City News Sonic Team Explains Why Sonic Drives a Car in Racing Games

Takashi Iizuka says Sonic chooses to race in a car for fun and fairness, giving fans a direct answer ahead of Sonic Racing: CrossWorlds.

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To be honest, I enjoy seeing Sonic in a car. Reason why I say that is because 2 reasons. 1st reason, Sonic runs faster than the speed of sound (768 MPH). 2nd reason, it’s fair competition.