Originally Posted by CL&T
To answer the original question, all 2 stroke manufacturers tell you not to use lower than 89 octane. I don't know of any 4 stroke manufacturers that tell you that. So unfortunately if all you have in E0 (ethanol free) is 87 you are stuck with using E10 89 octane in your 2 strokes. I see no problems and only advantages to using the E0 87 octane in your 4 stroke stuff.
Just for clarification- Stihl 4 mix engines may run on 2 stoke mix, but they are still 4 stroke. So are the Shindy C4 machines. They recommend 89 or higher octane as well for all their equipment to keep it from running too hot.