Running E0 on a E10 tune

[Maynerd]

My car is tuned on 91 octane. It was tuned in Minnesota a while ago before I bought it. During that time Minnesota had a law that all gas had to be E10. Well I like in Iowa and 91 E10 is difficult to find. 91 E0 is everywhere. I was wondering if I could 91 E0 in my car without issue. I understand it may run a little rich, but that’s not a huge deal is it? Please enlighten me.


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[MG0h3]

I’d try and find the octane rating of E10. I kindof feel like it’s negligible but unsure.


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[Bdubbs]

My car is tuned on 91 octane. It was tuned in Minnesota a while ago before I bought it. During that time Minnesota had a law that all gas had to be E10. Well I like in Iowa and 91 E10 is difficult to find. 91 E0 is everywhere. I was wondering if I could 91 E0 in my car without issue. I understand it may run a little rich, but that’s not a huge deal is it? Please enlighten me.


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How long ago was this? I could buy 91 non oxygenated fuel for the last 15-20 years here in Minnesota. It was just harder to find.

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[Maynerd]

This was in Minneapolis maybe 5 years ago. I was always told that it was mandated up until a couple years ago


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[2003RedfireVert]

It should run just fine. I bet the computer can and will compensate the fueling. It will be negligible.

 

[2003RedfireVert]

We were on a road trip several years back in our 2009 Malibu 2.4L. We had 4 grown adults plus luggage. We were averaging 26-28mpg the whole trip. In OK we stopped for gas and all they had was Ethanol Free gas so I filled up. I kid you not, our MPG went up to 32-33 mpg on that tank (same driving, same cargo, same everything). I was pretty amazed. It went back down when we got "normal" E10 gas. This makes sense since you have to burn more gas+E due to the ethanol content.

 

[Dusten]

91 octane is 91 octane. By law it has to meet that minimum requirement. The e10 uses ethanol and gasoline to achieve it. E0 is just a pure gasoline mix. You'll be perfectly fine.

When you hear people talking about e30 and e50 tunes their running a 91(92/93) octane fuel and adding e85 to get an e30/e50 blend. This is increasing the octane.

Look at the e85 pump. It'll say 105 octane min.

 

[Dusten]

Just for fun. Pure ethanol has a btu rating of 76330. Gasoline is 112,114.

This means ethanol has about 68% as much power and needs approx 32% more fuel.

So if you filled up with 20 gallons of e10/91 blend you have a total btu rating of 108535 per gallon

This is only a 3.2% difference. Your vehicle can easily accommodate this.

 

[efnfast]

We were on a road trip several years back in our 2009 Malibu 2.4L. We had 4 grown adults plus luggage. We were averaging 26-28mpg the whole trip. In OK we stopped for gas and all they had was Ethanol Free gas so I filled up. I kid you not, our MPG went up to 32-33 mpg on that tank (same driving, same cargo, same everything). I was pretty amazed. It went back down when we got "normal" E10 gas. This makes sense since you have to burn more gas+E due to the ethanol content.

ethanol is total bullshit - beyond crap gas mileage there's the issue of the damages it does if you arn't constantly cycling out the fuel, especially on small engines like tractors and carbs ... I go out of my way to only buy E0 gasoline, but it's getting so much harder to find it these days because of nut-job tree huggerss.