The only major difference I remember between US and the old Imperial measure was US quart = 32 oz, Imp. quart = 40 oz. This always seemed to matter in a few ways: 1: milk cartons held 5 cups, 2: a pint of beer was 20 oz. Imperial, vs 16 oz. US, and 3: the price of a gallon of gas was not directly comparable between Canada & the US. The most important thing was: if you were sold a “pint” of beer, did it really have 20 oz., or were you being ripped off? Grocery store signs still specify produce in price per lb. as well as per kg. (the real price), out of tradition. Or maybe because it sounds cheaper.
Canada has been metric now for 40 yrs.
I think the US system was sometimes referred to (in the context of tools, particularly) as the SAE system (Society of Automotive Engineers).
Maupassant
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