Gallon
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The gallon is a unit of volume in British imperial units and United States customary units.
A 1-US-gallon gasoline can showing "U.S. Gallon" marking (for American use), imperial gallons (for some Caribbean countries' and territories' use), and litres (for Canadian use)
A Shell petrol station selling 2* and 4* (leaded petrol) by the gallon in the UK, circa 1980
A fuel station in the United States displaying fuel prices per US gallon
A fuel station in St Vincent and the Grenadines displaying prices in Eastern Caribbean dollars per imperial gallon
United States customary units form a system of measurement units commonly used in the United States and most U.S. territories since being standardized and adopted in 1832. The United States customary
Gallon
…The gallon is a unit of volume in British imperial units and United States customary units. The imperial gallon (imp gal) is defined as 4.54609 litres, and is or was used in the United Kingdom and its former colonies, including Ireland, Canada…
A tape measure with markings in inches, feet and centimeters
A 23.7 US fl oz (700 mL) bottle displaying both U.S. and metric units