The Question:

Do you know the weight (lbs) of a gallon of gasoline? A gallon of water? Thank you.

The Answer:

Thanks for e-mailing Information Please. According to the Science and Technology Desk Reference, the weight of a gallon of common fuel (such as gasoline) is six pounds. A gallon of water, on the other hand, weighs about 8.4 pounds.

—The Fact Monster