Yes you use just a little ethanol stabilizer per your gas tank size. You can over dose and it will be fine.

Car and truck engines are now designed to work with the ethanol fuel. Any smaller engines, boat, lawn equipment, snow blowers, pressure washers, generators, etc. the ethanol = death. Around here you can get ethanol free fuel, but the cost is too high. It is cheaper to buy the regular ethanol fuel and a good fuel supplement that will take care of the ethanol and preserve the fuel longer. Sta-bil, Startron, or Seafoam will do the trick and can be found on sale often. Buy yourself a case, it will not go bad. Using premium fuel will make your engine run a bit hotter. That could be good in some cases, but in most cases a warmer engine is not a good thing. I am not an expert, just my opinion, and this has worked well on my almost 30 year old outboard engine and it still runs like new. 

12 oz of Stabil... it says 12 oz treat up to 120 gal. Is the bottle such that you can see to put a small amount in each tank full?

 

I use Marine Phase Guard 4.  It has a handy one ounce ration-er on top.  Pretty cool.  I think Sta-Bil has something similar.