It is a tiny fraction of 1 gallon. - 0.008 gallons to be precise.
1.5 US gallons = 5.67811768 l
1.5 L= 1500 ml
1.5L is 1500mL
About 2,163 1.75mL per US gallon
3.5
About 3,785.4 mL per US gallon.
About 4,546.1 mL
1 US gallon = 4408.9 ml.
3,785.41 mL
One US gallon is about 3,785.4 mL
3785.41 ml
3,785 ml in a US gallon
There are 38,874 ml in a US gallon
1 Imperial gallon = 4.54609188 liters = 4546.09188 ml
1/2 US gallon is about 1,892.7 mL.
If water, it is 175 ml.
175 mL = 5.91745397 US fluid ounces