1 cubic inch = 16.3871 cubic centimeters = 16.3871 milliliters (rounded)
1 gallon = 231 cubic inches
20 gallons = 4,620 cubic inches = 75,708milliliters (rounded)
It doesn't matter what's in the 20 gallons.
It's the same number even if they're empty.
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A 20 Gallon tank can hold up to 20 gallons of water.
20 gallons
17,953.2 gallons
16.32 US gallons.16.32 US gallons.16.32 US gallons.16.32 US gallons.
800 bottles, each containing 20 oz (Imperial) will make 100 Imperial gallons.