Hondas showed the way around the straight-heavy City Centre Airport in Edmonton, led by Simon Pagenaud with nearly a four tenth advantage on second place.
Although most of the field was separated by less than a second throughout the session – first through 20th was by roughly nine tenths – Pagenaud laid down a 1:16.5391 on his 25th and final flying lap. He's a former Edmonton winner, having taken the 2006 Formula Atlantic race on the old Edmonton layout.
Fellow Honda runners Mike Conway, Justin Wilson, Graham Rahal and Josef Newgarden completed the top five. Conway and Wilson also made it into the 1:16 range, only 1:16.9s, though.
With Dario Franchitti, Scott Dixon and James Jakes next, the best Chevrolet was only Rubens Barrichello in ninth ahead of JR Hildebrand.
Series championship contenders Will Power and Ryan Hunter-Reay ran only 11 and 10 laps, respectively, and ended 21st and 22nd on the charts.
Practice one video highlights from IndyCar are below.