That depends on the type material you are referring to. Also, these are two different types of measurements. One is volume the other is weight or mass. Please edit your question to include more context or details.
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A ton is 2000 lbs, so 13000/2000 = 6.5 tons
Assuming mg is milligrams (the standard abbreviation) the answer is none. A milligram is a measure of mass. A gallon is a measure of volume. The two measure different things and,according to basic principles of dimensional analysis, conversion from one to the other is not valid. If you are not convinced, consider a gallon of air. How many milligrams? Next consider a gallon of molten lead. How many milligrams?
You can't convert that.
169,000,000
1000