The result of your conversion between ounce/cubic inch and ounce/gallon [US] appears here
To convert between Ounce/cubic Inch and Ounce/gallon [US] you have to do the following:
First divide (0.45359237/16)/(0.0037854118/231) / (0.45359237/16)/0.0037854118 = 231.
Then multiply the amount of Ounce/cubic Inch you want to convert to Ounce/gallon [US], use the chart below to guide you.
Symbol: oz/in³
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Symbol: oz/gal
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