How much less does the fuel in a 5 gallon can weigh than the water in a 5 gallon bucket?

A gallon of water weighs approximately 8.34 pounds, so 5 gallons of water weighs about 41.7 pounds. In comparison, gasoline weighs around 6 to 6.3 pounds per gallon, making 5 gallons of gasoline weigh roughly 30 to 31.5 pounds. Therefore, the fuel in a 5-gallon can weighs about 10.5 to 11.7 pounds less than the water in a 5-gallon bucket.