what fuel do I use?

You could help yourself a little bit more than you do..

You might have said it's a Ryobi Strimmer
You might have said it's a 2 stroke
You might have used the search box on the top right of this page

Had you done so you might have arrived at this place...

http://howtomendit.com/answers.php?id=81974

Where the answer can be found...

Happy strimming...
June 2015