I just bought a Stihl string trimmer, at a dealer. I'd read on the net that Stihl engines require at least 89-octane, but hadn't seen anything about that in the literature. So, I asked.
The sales guy said that they didn't _need_ high octane, but you should _use_ "premium" gas ("93"), because it's "cleaner", that it's filtered more, and that "cheaper" gas would gum up the carb.
I was a little surprised at this, but there's a lot I don't know. I don't see where he had any reason to lie - I was already buying the thing.
Does anyone know whether there's any truth to this?
Thanks, George