(678 fluid ounces) / (128 fluid ounces per gallon) = 5gallons 38fluid ounces = 5gallons 1quart 6fluid ounces
324 ounces is a bit more than 2 1/2 gallons. It is exactly 2.53125 gallons. Hope this helps.
8000 US gallons = 1,024,000 US fluid ounces
192
1 gal(UK) = 159.999 fl oz(UK)