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1 g wt. = 0.00026 gal
1 gal = 3,785.41 g wt.
Definition of grams of water provided by Dictionary.com
The basic unit of measurement for mass in the metric system; one cubic centimeter of water has a mass of approximately one gram.
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