The consensus from several NASCAR Cup Series drivers after practice Friday at Phoenix Raceway was that there was no discernible difference with the rules package.

“I forgot they did anything until they started talking about it afterwards,” Chase Elliott said. “I don’t see it really changing a whole lot. I could be totally wrong, but I don’t think it’s going to change much.”

Cup Series teams had 55 minutes, an extended practice session, to work through the new package. After a two-day test at Phoenix Raceway in December, NASCAR made tweaks to the short track and road course aero package, continuing to look for a package that produces better racing with its Next Gen car. Among the features of the aero package are a simplified rear diffuser with fewer vertical strakes, no engine panel strakes and a three-inch spoiler.

William Byron was disappointed after practice but seemed more focused on the traits and speed of his Hendrick Motorsports Chevrolet. Byron was 24th fastest in practice after dominating at Phoenix in the fall.

The noticeable difference in feel for Ty Gibbs was the rear diffuser. It was expected that drivers would have to hustle the car more or be able to slide more with the changes.