June 13 2015 Michigan Quicken Loans 400 NASCAR Happy Hour Practice Speeds and 10 Lap Averages Ryan Rantz NASCAR News, Practice Speeds Final Practice, Michigan, Michigan 10 Lap Averages, Michigan Practice Speeds, Michigan Practice Times, Michigan Quicken Loans 400, Michigan Quicken Loans 400 NASCAR Happy Hour Practice Speeds and 10 Lap Averages, MIS, NASCAR, ten-lap averages Michigan Quicken Loans 400 NASCAR Happy Hour Practice Speeds and 10 Lap More