September 14 2013 Chicagoland Geico 400 Happy Hour Practice Speeds and 10 Lap Averages Ryan Rantz NASCAR News, Practice Speeds 10 Lap Averages, 2013, Chicago, Chicago 2013, Chicagoland, Chicagoland 10 Lap Averages, Chicagoland Geico 400, Chicagoland Geico 400 Happy Hour Speeds, Chicagoland Happy Hour, Chicagoland NASCAR, Chicagoland Ten Lap Averages, happy hour practice speeds, NASCAR Final Practice, NASCAR Happy Hour Practice Chicagoland Geico 400 Happy Hour Practice Speeds and 10 Lap Averages (PDF) More