how many fluid ounces are in a gallon?
In USA: 1 gallon = 128 fluid ounces 1.4 gallon x 128 fluid ounces/gallon = 179.2 fluid ounces In UK: 1 gallon = 160 fluid ounces 1.4 gallon x 160 fl oz/gal = 224 fl oâ¦z.