Austin Dillon led both NASCAR Camping World Truck Series practices Thursday at Kentucky Speedway.

Dillon's lap at 172.436 mph bested Kyle Busch to top the leader board in the opening session. Busch ran a lap at 172.106 mph, followed by Stacy Compton, Johnny Sauter and Mike Skinner.

Jeffrey Earnhardt will make his second career NASCAR Camping World Truck Series start in the Built Ford Tough 200 Friday, September 3, 2010. The fourth generation driver will pilot the No. 47 Rick Ware Racing entry.

“I’m excited to be back in an RWR truck, and I can’t thank Fuel Doctor enough for their support," said Earnhardt. "I’m ready to get to Kentucky and jump behind the wheel again. It seems like it has been forever since Gateway.”

Kyle Busch is definitely on a roll, holding off Todd Bodine to win the EnjoyIllinois.com 225 Truck Series event at Chicagoland Speedway Friday night, his fourth major NASCAR victory in the past 10 days.

Busch, who started fourth, pulled away from polesitter Todd Bodine on the green-white-checkered finish to capture his 20th career NASCAR Camping World Series win.

Todd Bodine turned in the fastest lap during NASCAR Camping World Truck Series Happy Hour at Chicagoland Speedway on Friday, covering the 1.5-mile D-shaped oval at 174.261 mph. Austin Dillon, who led opening practice Thursday evening, was second quick in the final practice session.

Dillon ran a lap of 173.555 mph in Thursday's session before posting his fastest lap at 174.177 mph in Happy Hour.

James Buescher, Shelby Howard and Aric Almirola rounded out the top-five.