No "but's" about it, when it's old you'll recognize that fact by the smell.
I'm unable to describe it, but a whiff compared with what is in your Element will tell you instantly.
using STA-BIL to extend the life of the gas, aren't you?
I bought a good sized container of STA-BIL @ Wal-Mart, but it's also available at auto parts and lawn care stores. A metal-rimmed string tag on which to write the date the gas container was last filled and fastened to the handle will keep track of the age.
If you prefer to avoid frustration, following these instructions will help to avoid aggravation.
Did you run the generator
dry the last time? Normal procedure should be to pour the dregs from the tank, and then run it until it quits. This prevents "varnish" build-up in the fuel system and spoiled gas in the tank. The alternative may be to rebuild the carburetor and clean the fuel system so it will start the next time.
Mike and Bob have suggested the solution for disposal, but I would not put more than one can of old gas per your Element's tankful.
& Ann K.
P.S., Rick owns a Casita
similar to Ann's & mine.