I mostly use a digital gauge, as in I use my digits (thumb) to press on the tire and feel how hard it is. But the gauge on the floor pump shows less than 10psi. Rolling resistance doesn't feel bad (Dillinger 4, I've used them tubed and tubeless)

I think when I had Endomorph and Larry tires I probably ran them a bit higher but I'd guess not much more than 12psi.

While Hypno Toad's average speed/pressure numbers are interesting, it is hard to draw conclusions because conditions have a huge impact on rolling resistance. I can tell you that on his ride at -10F rolling resistance was way higher than it would be on a ride at 20F. It takes a lot more effort the colder it gets. Tires get stiffer, you have more clothes on, snow gets grippier... and it just takes a toll on you.