I always thought 3 months with ethanol and 6 months no ethanol with no treatment.
I went to their website and it says up to two years with stabil depending apparently on the date code of your bottle not the day you add it to the gas. I did not email the mfg for clarification, I could have interpreted it incorrectly.
I always thought ethanol attracts moisture thus the shorter shelf life.
HOW OLD IS YOUR BOTTLE?
The stamp/code on the back of the bottle will help determine the date it was manufactured.
For example: 16264-87649-2233. This bottle based on the code was made on the 264th day of the year 2016. In the first five numbers, the first two numbers determine the year (in this case 16) and the last three numbers (264) tell you what day in the year based on the JULIAN Date Calendar.
https://www.goldeagle.com/brands/sta...AaAkC3EALw_wcB