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Best Answer: Gallon is a unit of volume, Kg is a unit of weight (mass). Considering a liter weighing 1 Kg (water for instance), then a gallon weighs 3.7854118 Kg. To expand upon Robert's answer... A kilogram is a mass; a gallon is a volume - to convert between the two you need to know the density of the liquid. Then, you can take 1 gallon, multiply by density (make sure it's in the form kg/gallon - you may need to do some conversions) and you'll get mass. anonymous Â· 9 years ago.
Fuel-approx 6.4lbs per gallon. Gallons to pounds conversions for various substances are here: http://www.convert-me.com/en/convert/weight2volume. Check weight to volume conversion page of our site.ounds is a measure of weight. Gallons is a measure of volume. They are not compatible units. You need to know what material you are talking about, with its unique properties (specifically, its density) before you can start looking at volumes and weights in any kind of meaningful relationship.