What happened: McLaren reviewed Friday practice at the United States Grand Prix at Circuit of the Americas, focusing on the early effect of the upgrade package it brought to Austin.

Why it matters: The package includes experimental floor changes to the MCL40, the team's first major update after 17 rounds. Lando Norris said after practice that McLaren is still 'a step behind,' so Friday's running gave only a first indication of how much the new parts help.

What to watch: Qualifying at COTA will give the first single-lap measure of whether the new floor narrows the gap to the front.