September 19 2015 Chicagoland NASCAR Happy Hour Practice Speeds and Averages Ryan Rantz NASCAR News, Practice Speeds 10 Lap Averages, 2015, Chicago, Chicagoland, Chicagoland NASCAR Average Speeds, Chicagoland Practice Speeds, NASCAR Average Speeds, NASCAR Practice Speeds, ten-lap averages Chicagoland NASCAR Hapy Hour Practice Speeds and 10 Lap Averages (PDF) Missed More