2 gallons will he have to buy
In both imperial and US customary units, the gallon is a unit of volume. The imperial gallon (imp gal), which is or was used in the UK, Ireland, Canada, Australia, New Zealand, and some Caribbean countries, is defined as 4.54609 liters; the US gallon (US gal), which is used in the US and some Latin American and Caribbean countries, is defined as 3.785411784 L; and the US dry gallon (usdrygal), which is defined as 18 US bushel.
A gallon contains four quarts and two pints respectively. The differences between imperial and US gallons are explained by variations in pint sizes.
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