I found out from my local Stihl dealer that there is a Sunoco station in downtown Nashua(about 5 miles away)that sells racing fuel. It is 100 octane. He said it is about $8/gallon, but it will stay fresh for six months and not cause all these problems. Gonna get me some.
Regards
Jimbo
good for you.
since you will not burn gallons per day, the high cost is not too much overall.