Ethanol vs non Ethanol gas question

[ronsdream]

I'm running a coyote engine in my MK4 and ready to start driving.
I heard yesterday that not only should I be running high octane 93 gas bu make sure to use NON-ETHANOL gas.

Has anyone had issues with Ethanol Gas?

Ron

[edwardb]

Zero issues with running regular pump gas in my Coyote for the past four years. Have used multiple brands but typically run premium from Costco. Best price plus with the volume they pump confident that it's fresh. All pump gas in this area (SE Michigan) has ethanol. Complete non-issue in my experience.

For whoever told you that, I wonder what gas they think Mustangs have been running since the first Coyote almost 10 years ago? Maybe they're confusing regular ethanol gas (typically up to 15%) with E85? A stock Coyote shouldn't be run with E85. It can be tuned for it. But not out of the box.

[GoDadGo]

Just remember to NOT let the car sit over an extended period of time with Ethanol Laced Gas in the tank.

[JohnK]

Pump gas with ethanol can create problems if it sits in a tank for a long time, but that can be mitigated by adding Sta-bil fuel stabilizer (ideally, the Marine ethanol treatment) and storing the car with the tank as full as possible. Ethanol will bind with water molecules the air and undergo phase separation, where the ethanol/water molecules separate out of the gas and drop to the bottom of the tank. By keeping the tank full when the car is stored, you minimize the amount of air in the tank. Doing these two things should allow you to store a car for over a year without ethanol phase separation issues.

[edwardb]

Pump gas with ethanol can create problems if it sits in a tank for a long time, but that can be mitigated by adding Sta-bil fuel stabilizer (ideally, the Marine ethanol treatment) and storing the car with the tank as full as possible. Ethanol will bind with water molecules the air and undergo phase separation, where the ethanol/water molecules separate out of the gas and drop to the bottom of the tank. By keeping the tank full when the car is stored, you minimize the amount of air in the tank. Doing these two things should allow you to store a car for over a year without ethanol phase separation issues.

Exactly what I've done the past 10 years with my cars here in the frozen tundra of Michigan. Pretty much storage only from Thanksgiving to Easter. Keep the tank full, give the full STA-BIL treatment, and always has been good to go when the time comes. Same thing in the mowers and all other gas powered stuff.

[NAZ]

Lot's of good advice here. Ethanol blends are what is commonly available and I don't see that changing for the better so we have to learn how to deal with it. I'm lucky as I have a non-ethanol blend available and will run that in the toys.

[JohnK]

This website lists gas stations in the US that have ethanol-free gas available. Unfortunately, there are none anywhere near me.

https://www.pure-gas.org