The two both took turns in the Joe Gibbs Racing entry, but combined ran just 22 laps in the only practice session of the day at Daytona International Speedway. The 18-year-old Logano has had a roller-coaster Speedweeks, wrecking last week and scraping the wall in an earlier practice session, but rebounding with a fourth-place run in one of Thursday's qualifying races.
Only 37 drivers participated in the practice, which was paced by Jamie McMurray.
Busch, who won the second of Thursday's qualifying races, did not turn any laps in his own Toyota. Aric Almirola, Denny Hamlin, Scott Speed, Jeremy Mayfield and Scott Riggs also took the day off.
"It's pretty common practice during Speedweeks," said Mike Ford, Hamlin's crew chief. "It's time to start check-listing your car and take that time to work at a relaxed pace and make sure that things are right for the 500. You don't want to get into a situation where you put a lot of miles on your race engine."
Robby Gordon had the second fastest car in the one-hour practice session. Paul Menard, AJ Allmendinger and Greg Biffle rounded out the top five.
Jeff Gordon, winner of the first qualifying race on Thursday, was sixth. Daytona 500 pole-sitter Martin Truex Jr. was 25th.
Dale Earnhardt Jr. was 35th out of 37 drivers, one spot below two-time series champion Tony Stewart.