In my neck of the woods, though, I don't think many people know how

 If memory serves:  Canada  in Paris, in 1965, agreed with many other
countries to begin metrification (except the USA) Then slowly introduced
it to the nation  starting with the temp scale and then the metric tonne
(for exporting) and then weights (Kg... which is really a 'mass' unit)
in grocery stores etc etc. Meanwhile the school system(s) each under
provincial jurisdiction each decided to introduce it in the math and
science programs and their own speeds. So it was a slow process. Since
us old guys had obtained our university degrees prior to all that
.............. we had to learn on our own.
Of course the science courses always did measure the properties of
physical objects in metric. Thus it was easy for me. By the way the
official metric unit for temp is the Kelvin  (i.e. 0 deg C = 273 deg
K)........ guess the politicians would never understand that at 250 K it
could still be cold.........

So more to your point............ most the people born in 1940 or
earlier still think in MPG

 When will those

The only concession the US did was to 'invent' the "Long Ton" which is
2200 lbs and which is roughly equal to a metric tonne (1000 Kg)
 I'll be embarking

Fuel is much cheaper in the US (except in CA)

Stay warm and happy

Fud