Dumas tops Saturday practice Porsche factory driver Romain Dumas was quickest again at Mosport International Raceway on Saturday in the first official practice for Mobil 1 presents the Grand Prix of Mosport. The reigning overall champion at the 24 Hours of Le Mans set a lap of 1:07.489 (131.168 mph) around Mosport International Raceway for Muscle Milk Team CytoSport in its Porsche RS Spyder.
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