The result of your conversion between foot pound and ounce/gallon [US] appears here
To convert between Foot Pound and Ounce/gallon [US] you have to do the following:
First divide 1.3558179 / (0.45359237/16)/0.0037854118 = 0.18103758
Then multiply the amount of Foot Pound you want to convert to Ounce/gallon [US], use the chart below to guide you.
Symbol: ft lb
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Symbol: oz/gal
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