In flight planning we assume 6 pounds per gallon for fuel
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It depends on what you have 12.5 gallons of. Water weighs 8.34 pounds per gallon. so 12.5 gallons x 8.34 pounds per gallon =104.25 pounrds. Gasoline weighs only about 6.2 pounds per gallon. 12.5 gallons x 6.2 pounds per gallon = 77.5 pounds.
The weight of a gallon of gasoline is approximately 6.3 pounds or 2.8 kilograms.
A gallon of gasoline weighs approximately 6.3 pounds (2.8 kilograms).
Density is calculated as mass per unit volume, so to find the density in pounds per gallon, you would divide the weight (mass) of a gallon of water (9.4 pounds) by the volume of a gallon (1 gallon). Therefore, the density of water in pounds per gallon is 9.4 pounds.
About 8.35 pounds for one US gallon of water.