50:1= 2.6 oz oil to 1 US gallon of mid grade gasoline
40:1= 2.6 oz oil to .8 US gallon of mid grade gasoline
32:1= 2.6 oz oil to .65 US gallon of mid grade gasoline
24:1= 2.6 oz oil to .49 US gallon of mid grade gasoline
16:1= 2.6 oz oil to .33 US gallon of mid grade gasoline
50:1 = 2.6 oz oil to 1 US gallon of mid grade gasoline
40:1 = 3.2 oz oil to 1 US gallon of mid grade gasoline
32:1 = 4.0 oz oil to 1 US gallon of mid grade gasoline
24:1 = 5.33 oz oil to 1 US gallon of mid grade gasoline
16:1 = 8.0 oz oil to 1 US gallon of mid grade gasoline
Another way to figure your fuel to oil ratio is to determine how much fuel you want, say 2.5 gallons. To figure the ratio 40:1 for 2.5 gallons, you will need to figure out how many ounces of gas is in 2.5 gallons. 320 ounces is in 2.5 gallons. Now divide your desired Ratio (40) into 320 ounces. This will give you 8. This is the amount of oil in ounces you will need to mix to 2.5 gallons of fuel to get 40:1.