Relevant

FUEL
Premium unleaded petrol is recommended with quality 2 stroke oil. Manufacturers recommend different petrol / oil ratios for their 2 stroke engines. Follow their instructions. If in doubt 25 to 1 is the normal and cannot do any harm to 2 stroke motors.

How much 2 stroke oil to mix with the petrol is easy to work out with a calculator.
Look at the recommended ratio, divide the larger number by the smaller number and multiply the answer by the size of your container in ml.

e.g.  1.     25:1 ratio       4 liters petrol          add          160 ml oil       
        1 divided by 25      X         4000             =           160                   

e.g.   2.    50:1 ratio        5 liters petrol          add          100 ml oil                  
         1 divided by 50      X         5000            =            100