I've got a ryobi. Part of the Expand-it range. I have the strimmer and cultivator heads. I use unleaded and two stroke. On the petrol cap, it tells you what the ratio of petrol
il is, 50:1 I think.
Its a nice bit of kit and easy for me, a mere girlie to handle, so a bloke should have no bother with it.
To be able to have the cultivator ead, they recommend you get the 30cc one.