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most good quality (stihi/husky) two stroke oil now comes with a fuel stabilizer.
the Stihl rep reccomends mid grade fuel (think it was something about too much oxygenating stuff in the super unleaded)
if you need to get rid of old mixed fuel, add it to your pickup's tank when its 3/4 full or near full...will mix right in...
my 2 cents..
-tuckermtn
I only use Stihl 2 cycle mix in all my 2 cycle engines. The only Stihl I have is a 310 chainsaw, but it seems to be good mix. I buy the 2.5 gallon mix bottles and mix 1/2 of it in a gallon jug, so it is a little strong. Better too strong than too weak and I do agree on the metal cans. I have about 6 or 8 plastic ones. I was using the Tanaka mix for my Tanakas, but ran out this year. I will probably pick up some next year for them and that is the only thing they recommend.
You could also try adding some gas line antifreeze with isopropyl alcohol to the fuel. If the fuel picked up moisture from condensation the isopropyl will combine with the water and allow it to burn. I use the Stabil stuff for storage and it works great. Never had a problem with 2-cycle or 4-cycles after months of non-use. It also keeps carb diaphrams pliable.