1 US gallon = 3.78541178 liters. Only (!) if you mean pure water, then 1000 litres of water weigh 1 metric tonne. 1000 litres of water are 264.172052357 US gallons that weigh 1 metric
http://wiki.answers.com/Q/How+many+gallons+equal+o...

1. Weigh 1 gallon of your substance to get its weight in pounds. For instance, if you have a gallon of water, that typically weighs about 8.34 pounds. 2. Divide 2,204.6 pounds by
http://www.ehow.com/how_7624708_convertgallonsme...

4755.06 galons
http://www.chacha.com/question/howmanygallonsis...

About 273 gallons per ton. Source(s): Master mariner, +35 years
http://answers.yahoo.com/question/index?qid=200904...
