Er, you sorta got that backwards...
1 U.S. fluid ounce = 29.573 529 562 5 mililitres = 1.041 Imperial fluid ounces 1 Imperial fluid ounce = 28.413 062 5 mililitres = 0.961 U.S. fluid ounce 1 liquid U.S. gallon = 3.785 411 784 litres = 0.833 Imperial gallonJT