Kilo = 1000 so the answer is 600/1000 = 0.6 kilo gallons.
600 mL is about 0.158 US gallons.
600 liters = 158.503231 US gallons = 131.98 Imperial gallons.The search engine Google has a built in calculator which can be used for converting between different units and making calculations....
600 gallons = 76,800 fluid ounces
1 gallon = 4 quarts600 gallons = 600 x 4 = 2400 quarts