Officially Sanctioned Metrication in Canada
http://en.wikipedia.org/wiki/Metrication_in_Canada#Before_conversion
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The Liberal federal government of Pierre Trudeau first began implementing metrication in Canada in 1970. By the mid-1970s, metric product labelling was introduced. In 1972, the provinces agreed to make all road signs metric by 1977. There was some resistance to metrication, especially as the sectors of the economy where the federal Weights and Measures Act required metric to be used grew in number. The metrication of gasoline and diesel fuel sales in 1981 prompted 37 Progressive Conservative Members of Parliament to open a "freedom to measure" gas station in Carleton Place, Ontario, selling gas in both Imperial gallons and litres. The small city of Peterborough, Ontario was a noted hotbed of opposition to metric, having been one of the government's three test centres for the metrication process. Bill Domm, a Member of Parliament representing the riding of Peterborough, was one of the country's most outspoken opponents of metrication.
The election of the Progressive Conservative government of Brian Mulroney in 1984 slowed, and ultimately stalled, metrication in Canada. Regulations requiring metric measurements have either been repealed or are no longer enforced. As a result, Canadians today typically use a mix of metric and Imperial measurements in their daily lives.
Notwithstanding the end of officially-sanctioned metrication in Canada, most laws, regulations, and official forms exclusively use metric measurements. In fact, many imperial measures no longer have a legal definition in Canada. This has resulted in some companies (mainly brewers and bars) promoting "pint" and "quart" sized glasses or bottles, where in reality, they are often significantly less than that.
