Chainsaw Repair

For winter storage or long term storage prep methods, I'm finding conflicting information, so what is the best method? 

- Echo basically states to empty the tank, then run it until the engine stops on its own as a result of no fuel. (This is for their chainsaws though, and its carefully written, completely risk adverse cautions & warnings probably doesn't want the saw in a ready-to-start mode.)

- Stihl states to empty the tank, then place a small amount of premixed pure gasoline-oil (ie. Stihl motomix, Echo powerfuel) into the tank, then run the engine for a few minutes to ensure the premix reaches the carb and engine, then stop the engine. (This method makes more sense to me, presuming pure gasoline doesn't break down)

So which method is the best to maximize the life of the carburator (and fuel lines, etc.) ? 

I run 93 ethanol gas. I also use a Klotz mix that stays mixed with alcohol. I have yet to have any problems with mix setting for long periods of time  or separating.

I've tried 2 ways for longer storage. I have dumped and ran till carb empty.  I have left mix in then dumped before use.  I haven't seen any difference in my saws yet.

Mix I use is KL-200 Original TechniPlate Synthetic

I use the drain the tank and run until dry method.   I only run non ethanol fuel.

Same for me.  That's what I recommend to all my customers.
Shep

Thanks for the replies guys, sounds like either method works fine, just as long as the gas that was in the tank was treated. I was only asking because I had to replace the zama carb ($30) on my 5 year old echo srm230 trimmer. I don't want carb replacement to become part of my spring routine each year since I have about 6 small engine machines.

Up until last summer, I wasn't really treating the gas at all, but after I got my honda generator for partial backup, I didn't want any voltage fluctuations or drops as a result of bad or deteriorating gas. So now all my gas is treated with stabilizer and ethanol treatment as soon as it's purchased.

Just clean it up .. give it clean filters and put it aside it I need it again ... only drain the fuel if I'm working on it