The result of your conversion between pound/gallon [US] and hectogram/litre appears here
To convert between Pound/gallon [US] and Hectogram/litre you have to do the following:
First divide 0.45359237/0.0037854118 / 0.1/0.001 = 1.19826427
Then multiply the amount of Pound/gallon [US] you want to convert to Hectogram/litre, use the chart below to guide you.
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