After claiming the fastest speed in the lone Sprint Cup practice at Auto Club Speedway, Austin Dillon put up an encore performance in the final Xfinity Series practice.
In the No. 2 Chevrolet, Austin Dillon recorded a speed of 176.622 mph while running 28 laps around the 2-mile track.
Qualifying for the Treatmyclot.com 300 will Saturday be at 12:15 p.m. ET on Fox Sports 1.