It is by no means clear how “The Tonight Show Starring Jimmy Fallon” will hold up once it simultaneously loses its “new car smell” and Winter Olympics lead-in.

But when judged in a vacuum, Wednesday’s edition of “Tonight” delivered a slam dunk performance.

The episode, which featured guests Bradley Cooper and Tim McGraw and a pre-taped sketch with Jonah Hill and Martin Scorsese, posted a strong 5.2 overnight metered market rating. The show’s best Wednesday number since January 2, 2008, the rating slipped by less than 2% from Tuesday’s 5.3.

The impressive stability also extended to the coveted young adults demographic.

Wednesday’s “Tonight” delivered a 2.2 adults 18-49 rating in the 25 markets with Local People Meters. Tuesday’s delivered a 2.3 on that metric.