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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.

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16y ago

What else can I help you with?