Assertion: sport car's speed | /r/HasProperty | 254.04 mph
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Source sentences:
text: A Bugatti Veyron 16.4 Grand Sport Vitesse driven by the Chinese racing driver Anthony Liu at Volkswagen Group's proving grounds in Ehra-Lessien became the fastest open-top production sports car, with a top speed of 408.84 km/h (254.04 mph).