There are approximately 153.722 U.S. fluid ounces in an Imperial gallon. Although Canada officially adopted the metric system shortly after 1970, some Imperial measurements, such as the gallon, are still in use. The Canadian government defines one gallon as consisting of exactly 160 Imperial ounces, and there are approximately 1.041 Imperial ounces in a U.S. fluid ounce. The U.S. liquid gallon consists of 128 U.S. fluid ounces, and there are approximately 1.201 U.S. liquid gallons in an Imperial gallon.
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U.S. gallons are different from imperial gallons. 1 Imperial gallon is equal to 4.54609188 litres and 1 US gallon is equal to 3.78541178 litres. Liters on the other hand are the same everywhere. One liter equals 0.26 U.S. gallon or 0.219 Imperial gallon.
One Imperial gallon = 1.201 US gallons.
One Imperial gallon = 1 Canadian gallon.