Guys,,read the bottle,,no hair splitting,,,4oz to 10 gal. of gas. I used it for years and years,,,I use it in the oil only now. In the gas i use 2 cycle oil with tcw3, works the same way and lots of data in here to prove it. Only one(1) oz of 2 cycle oil to 5 gallons of gas,like 500 or 600 to 1 ratio,,,been doing this for at least 50k miles now,,all is well,sparkplugs clean, and my fuel pump is silent, starts well, gas mileage went up 1.5mpg, it cleans and etc,,works for me IMHO.