Never had a problem running my saws (chain saws and conrete saws) "dry" for years. AND ive never had a problem with bad fuel or gumming up either.
After I have finished using the saw for the day, and know I wont be using it for at least a couple weeks. I start, idle, stop. Drain all the fuel I can. Start and let run. When it gets to the point of starting to run funny due to fuel starvation, I play with the choke to get it to run more as much as I can. All at idle. Until its out.
I bet my life there is still a film of fuel oil mix on the crank/rod bearings and cylinder wall.
Ive had a saw sit for over a year after this technique, put fresh fuel mix in, choke, 3 pulls and it starts.
I only use high grade fuel (no ethanol) and high grade oil.