I was never taught the "imperial" system of measurement, it has always been metric. However we (Aussies) still refer to the old system in daily language and use both systems depending on the context.
I am 5,8 never 175cms
I weigh 65kilos never 143 pounds
My car gets 40mpg not kilometres per litre
We use 4x2 wood not 10cm x 5cm
A photograph is an 8x10 not an 20cm x 25cm
A drag strip is a 1/4 mile not 400metres
A drag car does 400kph not 250mph
The Indy 500 is 500 miles not 800kms
It's all very interesting
I once asked for a half dozen eggs and the girl said "they only come in packs of 6 or 12".