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1 dm3 = 0.26 gal
1 gal = 3.79 dm3
Definition of cubic decimeters of water provided by TheFreeDictionary
Cubic decimeter is a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints). Synonymous: cubic decimeter.
Definition of US gallon of water provided by WikiPedia
the US gallon is defined as 231 cubic inches (3.785 l), which is used in the US and some Latin American and Caribbean countries