Buying saw fuel

I bought fuel for the company car and saws. In the pic I'm adding two-stroke engine oil to the fuel container before adding the fuel. I'm not sure whether I need to do so anymore this year. After the lot I started working on yesterday I probably have only one more lot to do and the work might be over for this year.

The pic's a bit blurred but I wanted to document this part of my work while I still can. I think I haven't taken a blip of getting fuel though it needs to be done every week.