I don't know about others, but all of my (US-based) science classes used metric exclusively. Almost all math problems dealing with distance used metric as well.
(Funny story: I failed a 9th grade math quiz because I didn't know how many inches were in a foot. We never covered the US customary system! It really didn't come up often.)
That said, I still don't have an intuitive sense for converting miles to kilometers, or Fahrenheit to Celsius, simply because it never came up outside of the classroom.
(Funny story: I failed a 9th grade math quiz because I didn't know how many inches were in a foot. We never covered the US customary system! It really didn't come up often.)
That said, I still don't have an intuitive sense for converting miles to kilometers, or Fahrenheit to Celsius, simply because it never came up outside of the classroom.