Question: how many fluid ounces in a gallon of gas?
Answer: There are 4 quarts in a gallon and 2 pints in a quart, hence there are 4 x 2 = 8 pints in a gallon. Each pint is 16 ounces so there are 8 x 16 = 128 ounces in a gallon. Hence the 11.6 gallons that you want to add is 11.6 x 128 = 1484.8 ounces. Now think about adding the gas and oil a little at a time.