March 9 2013 Las Vegas Kobalt Tools 400 Happy Hour Practice Speeds and 10 Lap Averages Ryan Rantz Blog 10 Lap Averages, 2013, Average Speeds, Fantasy Racing, Las Vegas Kobalt Tools 400, Las Vegas Kobalt Tools 400 Happy Hour Speeds, NASCAR Las Vegas Kobalt Tools 400 Happy Hour Speeds and 10 Lap Averages More