I am open to other sources of these metrics, please feel free to provide them.

Here's one: 3 months emergency savings is the median position https://www.federalreserve.gov/consumerscommunities/sheddata...

There's a good summary on Matt Yglesias's blog of Matt Darling (economist at Niskanen Center and Twitter debunker of this paycheck to paycheck myth) on the subject: https://www.slowboring.com/i/149683266/the-median-financial-...