None.
A gallon is a measure of volume whereas a gram is a measure of mass. The two measure different things and it makes no sense to try to convert from one to the other. Just stop and consider what he mass of a gallon of heavy oil might be. And then think of the same volume of air. They will not have the same mass.
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One gram is equal to one gram.
1000 milligrams in 1 gram
Multiply the number of gallons times 3.785.
36.
No. A gram is equal to 1,000 milligrams.