1 milligram per liter = 0.000121703815 troy ounces per US gallon. So, multiply the number of mg per liter by 0.000121703815 to get troy ounces per US gallon.
Example, 500 (milligrams per liter) x 0.000121703815 = 0.0608519075 troy ounces per US gallon.
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