Worldwide Usage of Gallons
The imperial gallon is used in everyday life (and in advertising) in the United Kingdom and Ireland, and less frequently in Canada, including fuel economy expression in advertisements and other official publications. Gallons used in fuel economy expression in Canada is imperial gallons.
The gallon was removed from the list of legally defined primary units of measure catalogued in the EU directive 80/181/EEC, for trading and official purposes, with effect from 31 December 1994. Under the directive the gallon could still be used – but only as a supplementary or secondary unit. One of the impacts of this directive was that the United Kingdom amended its own legislation to replace the gallon with the litre as a primary unit of measure in trade and in the conduct of public business, effective from 30 September 1995.
Ireland also passed legislation in response to the EU directive with the effective date being 31 December 1993. Though the gallon has ceased to be the legally defined primary unit, it can still be legally used in both the UK and Ireland as a supplementary unit.
A German Government report on fuel prices dated 2010/11 stated that the Imperial gallon is used as a unit of measure for fuel in Guyana, United Arab Emirates and Antigua and Barbuda and the US gallon in Liberia, Belize, Colombia, The Dominican Republic, Ecuador, El Salvador, Grenada, Guatemala, Haiti, Honduras, Myanmar (Burma), Nicaragua, Panama, Peru, Puerto Rico and the United States. However the United Arab Emirates switched to using litres on 1 January 2012.
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