Steve
To make your life easier.
Take a 2 gallon cherry can (gas can). It is easier to mix the fuel.
I use a 2 gallon can .... poor 1 gallon of gas or Coleman/Crown camp light fuel in it and add your 10 ounces of oil.
So you don't have to distract 10 ounces of gas each time to add the 10 ounces...