I found this site while searching for the best method of disposing of old stale or contaminated gasoline. I am an old car guy and often have to drain fuel that has been sitting for years. I also find that good gas can go bad in as little as 30 days, and do not recommend mixing bad gas with fresh fuel and using it in cars, mowers or anything else you wish to run properly. IMHO ethanol in engine fuel does absorb water very quickly and while this is not a problem for you daily driver, a seldom used classic car, RV, boat ect. will have major problems unless stabilizer products are used or fuel is drained and replaced each season.
I recently had 15 gallons of fuel I had to remove from a customer’s car to replace a fuel pump. The gas didn’t smell too bad, so I decided to use it in my old (1962) tractor. Upon start up it seemed ok but perhaps less peppy than normal, but next time I started the beast it bent 3 pushrods! I apparently also used some of this gas in my 20 horse lawn tractor and it also bent a pushrod! Expensive lesson, and to everyone who thinks old gas is a good product for starting fires, I hope you get out of the hospital soon. This stuff can really ruin your day. There is no place in my area that I have found where I can take old gas for disposal, which is why I was searching in the first place.
Welcome. I assume this is the column to which you are responding?
There’s also this one.
http://www.straightdope.com/columns/read/582/is-alcohol-in-gasoline-good-or-bad
Did you call your local municipality, as Cecil suggested?
Visit any local garage and ask them who picks up their waste oil and Hazmat materials.