Here in Canada, we have to tighten our lug nuts to newton-meters (Nm). After quite a few decades since metrification I have NO flippin' idea what a Nm is. My big and small torque wrenches are in good ol' ft-lbs (or is it lbs-ft.?) - good thing, 'cuz our US made RVs tell us what lug nut torque should be in ft-lbs. Many of our tools here are bilingual, lol.
Having the correct torque on lug nuts is
very important as discussed on
this website for example.
An interesting demo is to take a few nuts and bolts of various sizes (like 1/4", 3/8", 1/2") and tighten them without a torque wrench and then check with a torque wrench to see how close you were. Most over-tighten and I think by a fair bit.
As a side note, I have no idea what our tire pressure should be anymore - kilopascals. Pffft... :M