Episode 18: When Takumi manages to keep up with them, Sayuki begins to doubt they can win. Mako's subsequent reply leads to this exchange:
Mako: You're the worst! Just excess baggage on the passenger seat!
Sayuki: Eh?! Bagagge?!
Mako: Yes! Just an extra dead weight on the car!
Sayuki: (thinking) She always changes personalities when she's behind the wheel (out loud) How can you call me an extra weight on the car?! I have a nice body, I'm not fat!!
Mako: You're giving me a 49 Kg handicap!
Sayuki: 47 Kg!