I have the privilege of using an ethanol tester at my dealership. All the samples I have tested, came back 0% . The disclaimer on the pump says up to ten percent.
Unless you purchase from the green hose that actually states it's blended, I think you are safe from the "poison" corn fuel
Personally, I think the majority of issues caused by "ethanol" can actually be traced back to poor maintenance of the machine. So many people will try to have you believe that ethanol destroys engines and internal parts and any ethanol gas that's more than a couple weeks old is garbage, which is nonsense.
As for storing equipment, an empty tank can and will form condensation inside the tank during relatively quick temperature changes as the moisture in the air that's trapped within the tank condenses on the inside of the tank. Filling your tank removes all of this air along with the moisture within that air and using stabilizer prevents the separation of fuel.
Here's what the EPA has to say and I have put in bold the important parts:
https://www.epa.gov/sites/production/files/2015-09/documents/waterphs.pdf
Conclusion Water phase separation in any gasoline is most likely to occur when liquid water comes in contact with the fuel. (Water in the form of moisture in the air will generally not cause phase separation.) Water which is in solution with gasoline is not a problem in any engine, but as a separate phase it can prevent an engine from running or even cause damage.
Since oxygenated gasolines, however, can hold more water than conventional gasoline, phase separation is less likely to occur with oxygenates present. For any gasoline, simple precautions to prevent phase separation from occuring should be taken. First of all, gasoline should not be stored for long periods of time, especially during seasonal changes which usually have large temperature changes associated with them. (For both oxygenated and conventional gasolines, gumming can also occur which is detrimental to any engine.)
If it is unavoidable to store gasoline for a long period of time, one should be sure that the tank is full to prevent condensation of water from the air, and the addition of a fuel stabilizer should be considered. Lastly, care should be taken not to allow water into the fuel system while filling fuel tanks or operating the engine -- in the form of rain or a spash, for example.
