E-gas is a major problem if you do not drive your car every couple of weeks as it separates in the tank and destroys old rubber hoses and gaskets. Stabilizers help prevent problems , but far better to try to use e-free fuel. I tuned my cars for the local 89 octane e-free and no trouble. When the gas tank on our 65 Mustang was drained after using e-10 92 octane, all kinds of water came out with the fuel. The car was only run every three to four weeks without stabilizer.
I'm not arguing but I want to point out that perhaps the worst blend of chemical compounds is for high octane leaded racing gas. NONE of these blends will be a perfect product.
The more people that are asked, the more there will be people that have issues will ALL blends of gas. The fact of the matter is the nature of any is that it is not intended to have stability over long periods of time. It's intended for you to use it within a "normal period of time" ( I hate the term normal).
I personally have found 10% ethanol unleaded Premium as stable as anything I've ever used.
I would tell you that if you choose to use SUNOCO Cam II unleaded racing gas, use it up within about 30 days. It will still run your engine after that but you will loose some of the octane raising additives.
One of the advantages of unleaded premium is that it runs way cleaner then leaded fuels. It doesn't leave the same type of deposits that leaded does. Anyone who reads the plugs in their engines can clearly see that.
Leaded leaves a mess and the compounds that remain in the exhaust sytem from it not only are corrosive and dangerous to the environment, but they are a health hazard TO YOU because you are the one most exposed to them from driving the car with that fuel.
The bottom line is that unleaded with ethanol is not a bad compromise and works pretty well.
I've owned my 68 GT350 since 1971, and experienced the switch over from leaded to unleaded. I have not experienced ANY of the published issues with that car by using unleaded. The high octane leaded caused lots of problems.
This is just my experience and I agree that others will have their own personal experiences BUT if you heard that this happeded to others and it didn't happen to you, you are just promoting the story of Chicken Little and in my view, the sky is not falling with ethanol.