If you get yourself either a 1000 ml (just over a quart) and/or a 4,000 ml graduate cylinder (just over a gallon), made of Nalgene or polypropylene, you can measure up just about any quantity of fuel. It is always easier to measure in ml instead of ounces. There are more markings on a 4000 ml graduate cylinder. Besides, how can you meaure 2.79 ounces of something? Not very well? A graduate cylinder is just a tall cylinder with markings on the outside of it. Some people use the 1000 ml glass Pyrex measuring cup available in many supermarkets, but the graduate cylinder is more accurate and a better long term solution to measuring out your fuel ingredients. If you mix it right and have a good formulation, it will work the same way every time. Use good clean ingredients and good quality oil and castor. Happy mixing.