#2-Brian Scott was quickest during happy hour for the STP 300 with a speed of 173.751mph. He was followed by: #3-Austin Dillon, #99-Alex Bowman, #6-Trevor Banye, #60-Travis Pastrana, #33-Matt Crafton, #21-Dakota Armstrong, #43-Michael Annet, #12-Sam Hornish, Jr., and #5-Brad Sweet. All 41 drivers participated in the session. See complete results on the Chicago practice 2 speeds page (pdf) .
