That's all I want it for, just to listen to that Banshee like howl!
I am quite uncertain, but are fellows here really recomending trimmers for bruschcutting work? Sorry guys but they wouldn't last a week in serious bruschcutting scenarios! Bruschcutter = ~40cc or larger, full antivib, high diametre shaft with heavy duty gear head. The micky mouse toys you can leave at home for the casual user.
I see a few problems existing.
First, the ethanol problem is totally blown out of reality. Yes it can cause problems, especially after changeover of non ethanol fuel to ethanol fuel, when the material is > a decade old, when leaving the fuel mix in your equiment over half a year and when storing your fuel in non certified fuel containers or exposed to high temperature changes (f.e. leaving the fuel containers rolling around in the sun...).
Second, ALL rubber components can be expected to deteriorate after at least a decade if not even sooner, irrespective of fuel quality.
Third, emptying the fuel tank on your equipement leaves fuel in the system. What is recomended is to empty the fuel tank and let your engine IDLE dry. That way the fuel system should be empty as far as possible.
It seems I sometimes have to choke it to keep it running a little longer trying to get the last possible bit out of the thing and leave it as dry as possible. I often will pull the starter another time and pump any primer till its dry then repeat the next day. When planning on storing long term I believe running an ounce out of the premix expensive fuel probably cant hurt but is probably overkill. My gas tools is older and almost everything was bought used so alternating tools as well not running W.O.T. the whole time I feel allows it a minute or two so it can cool down plus serious fatigue increases the chance of having a accident and chainsaw injuries can be real awful sometime. Can't forget the time cleaning up takes too. Lots of other work exists I feel and have a hard time understanding running a chainsaw for 6+ hrs during a 8 hr day like you mentioned by newforest earlier. Maybe I am slow doing cleanup but that takes me more then 20% of the time and probably over half what cutting takes. He also needs to be relentless about the chains condition since its the chain doing the cutting action. Imagine doing all your splitting using a just the sledgehammer vs axe an see how you feel afterward + and how long it takes. I could take 15 minutes when I should take 1 burning thru stuff like a dummy. Stopping to keep chains as close to peak with file or swapping saves time overall and always helps you get more accomplished and longer life for your stuff cause its run fewer hrs. Condition of the gas cap and tightness seems to be forgotten about by far to many people and is so important.