u/Conscious-Syrup8610

I've been exploring CPP/CPM recently and I've read quite a few popular credit cards blogs which all show United to be 1.2 CPM. However, even without the cardholder benefits, when I go to United I frequently only see much higher (1.4+), so where is the 1.2 number coming from on NerdWallet and many other blogs? Is there actually an average calculated across a wide segment of flights versus the points required, or is this just somewhat anecdotal?