Harrison Burton was fastest in the final Xfinity Series practice session Friday at Auto Club Speedway.
The Joe Gibbs Racing driver recorded 22 laps and posted a top speed of 174.474 mph in the 25-minute session.
Burton also had the best 10-lap average at 170.422 mph.
Gragson recorded the most laps in the session with 25.
There were no incidents in the session.
Noah Gragson led the way for the Xfinity Series in the opening practice session that saw more than half the 50-minute period under caution at Auto Club Speedway
Gragson ran a top lap of 177.139 mph. He was followed by Austin Cindric (176.022), Daniel Hemric (175.400), Brandon Jones (175.366) and Harrison Burton (175.187).
Alex Labbe brought out the caution when an oil line came loose and he put oil down on the track. The cleanup took about 20 minutes.
Tommy Joe Martins brought out the caution late in the session with smoke coming from the car and then a small fire in the right front of the car.
Being on 🔥🔥🔥 is not how we want to tweet about @TommyJoeMartins each week.
— Xfinity Racing (@XfinityRacing) February 28, 2020