F1 was higher in the 18-49 on Sunday, but not much.
I don't think there's any reason to panic. The main reason for the double digit drops during the playoffs is Chase Elliott missing out.
NASCAR just needs to make sure Chase Elliott makes it to the final four every year from now on. (I'm being facetious.)
Plus, there were some huge games in that 1pm window. Most of the country either had Rams/Cowboys (Cowboys are ALWAYS an enormous ratings draw, which is why their games are usually in primetime) or Eagles/Redskins on Fox at 1pm, and then CBS had the Jaguars/Steelers game that should've been flexed to primetime and the Battle of MetLife in the 1pm window.
I think there have been some outstanding NFL matchups this year which I’m sure has impacted NASCAR. Just need to get Chase Elliott healthy and have more games featuring the Giants & Bears!