Dillon, who earned his first NASCAR Cup Series victory at Charlotte in 2017, posted the fastest average lap speed (179.450 mph) in the final practice session among All-Star Race participants.
Ryan Blaney was second (178.560 mph) and Clint Bowyer was third (178.336 mph). Joey Logano and Denny Hamlin completed the top-five.
Rounding out the top-10 were Kevin Harvick, Erik Jones, Aric Almirola, Ryan Newman and Kyle Busch.
Following the regular practice, teams were allowed to take part in pit stop practice. Qualifying for the All-Star Race is the only one of the year which includes a four-tire pit stop as part of the qualifying process and also no speed limit on pit road.