If you have exactly 1 gallon 20:1, including the oil, you would have 6.09 ounces of oil and 121.91 ounces of gas, so you would put another 121.91 ounces of gas in to make it 40:1.
If you do like most and get one gallon of gas and then add the oil to make your 20:1 solution, you would actually be starting with 128 ounces of gas, plus 6.4 ounces of oil and would need to add one gallon of gas to make it 40:1.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
