I used to mix my own too, but since I went to premix, I have zero issues. My Dad kept having problems with his older Stihl saw before he switched to premix. The closest place we have to buy ethanol free pump gas is about an hour away.
Even my dealer, who sells Stihl, Echo, Red Max, husquvarna equipment told me if I was going to use ethanol pump gas, to use it all up in 30 days, otherwise I'd have problems. How in the hell I'm I gonna use a whole gallon in one month just doing my yard?
It's a shitty thing that its come down to this just for a man to trim his own yard.
I have both Stihl and Echo equipment. The price of the Stihl equipment wasn't too hard to swallow, but the Stihl repair costs were. $200 to rebuild a $260 saw? What's the purpose of rebuilding it at that price?