George wrote:
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

Many Stihl chain saws require premium gas for the higher compression to
get the needed power. Sounds like the salesman was applying this to
all Stihl products, which isn't true.