April 11 2014 Darlington Bojangles Southern 500 Practice #1 Speeds and Averages Ryan Rantz NASCAR News, Practice Speeds Darlington 10 Lap Average Speeds, Darlington Average Speeds, Darlington Bojangles Southern 500, Darlington Practice #1 Speeds, NASCAR, NASCAR 10 Lap Average Speeds, NASCAR Average Speeds Darlington Bojangles Southern 500 NASCAR Practice #1 Speeds and 10 Lap Averages More