>>We have metric in Canada
If you head toward Canada you'll see signs with distances in both units: Montreal 100 mi./160 km
and of course once you cross the border, there are reminders
that speed limits are in metric (km per hr)
For a few years I remember TV and radio stations doing temps in both styles but after awhile, US stuck to just Imperial.
(And digital bank thermometers would give temps in both styles
but other than maybe up nr the Canadian border, that has
also stopped, from what I can see)
And yup, your US bought car does have the km per hour
in small print under the mph. (I don't have a digital readout on my speedometer but I assume they have a button you press which would give you km p.h. etc.)
We had signs like that for a decade or so in California with distances in both miles and kilometers, but like the red colored "55" on 70s and 80s speedometers, they have disappeared and been replaced with mileage only signs.