Although some would say "None. 128 is 1 gal." fractions and decimals give a true answer: .4375 - almost half a gallon.
56 US fl oz = 1.66L
56 oz
2
Eight gallons equals 1,024 fluid ounces.
256 fluid ounces equals 2 US gallons.
512 ounces in 4 gallons
That is approximately 56 fl oz.
265316.9 fl oz equals 1725.96 imperial gallons
That is 1,920 ounces
2.5 oz
3 and 1/2.
2.37 gal