Ethanol Free Gasoline

[gooffeyguy]

I've experienced mine stabilizing performance wise after the 4th or 5th tank on straight E85 before. Each tankful was getting higher and higher with regards to alcohol content too. In addition, mine seems to be always re-analyzing what's in the tank and adjusting the alcohol content, even if just a percent or two when the same fuel is in the tank for a week or four.



Well, my light comes on when there's still 5 gallons on board so I figure for 26 gallons usually. So if yours is similar 22 and 4. The final numbers depend on what the remnant is too and I take that into account as well. The numbers wouldn't be as high is we were pouring that mix on top of 87 that was still in the tank.

Mine comes on with 7-8 gallons left

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[swathdiver]

Mine comes on with 7-8 gallons left

Send me an email and I'll send you my little excel spreadsheet calculator for figuring it out. It's not perfect but gets real close. Meaning, there is not a linear difference between the alcohol content of ethanol and its effective R+M octane rating. E85 at 70% will have a different octane rating than E85 at 75 or 80 percent for example.

[email protected]

 

[GranPrix]

...Oh, but yours delivers 99 octane and 45% alcohol content! Hmm. LOL

Is this somewhat accurate or off the top of your head?

 

[swathdiver]

Is this somewhat accurate or off the top of your head?

The former. From my armchair I have no way of knowing the actual alcohol content of the various fuels being mixed.

 

[Pscott]

I've experienced mine stabilizing performance wise after the 4th or 5th tank on straight E85 before. Each tankful was getting higher and higher with regards to alcohol content too. In addition, mine seems to be always re-analyzing what's in the tank and adjusting the alcohol content, even if just a percent or two when the same fuel is in the tank for a week or four.



Well, my light comes on when there's still 5 gallons on board so I figure for 26 gallons usually. So if yours is similar 22 and 4. The final numbers depend on what the remnant is too and I take that into account as well. The numbers wouldn't be as high is we were pouring that mix on top of 87 that was still in the tank.

What kinda mpg after 4tanks because I lost mpg when trying one tank not sure if it’s worth it?

 

[swathdiver]

What kinda mpg after 4tanks because I lost mpg when trying one tank not sure if it’s worth it?

Worth it how? If you are looking at it strictly from a cost point of view, you'll want to compute for cents per mile. My truck runs awesome on E85 and gets better mileage on low levels of alcohol versus running 93 octane gasoline. But to determine whether it's worth it or not, I have to consider the prices of the various fuels.

 

[Elmo]

While driving through VA today (I live in NY) I came across a WaWa gas station that had "Ethanol Free Gasoline". I've never heard of this and didn't have time to google it then and there but did a quick search now and some sites say no changes and others say you can get increased mileage and better for older cars.

My '08 Yukon XL Denali says to use Premium but I've always used Regular, and I'm curious if anyone uses this gas and their thoughts on it?

My owners manual says 87 octane or higher but the sticker on the fuel door recommends premium.

 

[wjburken]

My owners manual says 87 octane or higher but the sticker on the fuel door recommends premium.

Running 87 in my 2007 and 2008 6.2 would put me on the edge of pinging. I would highly recommend running 91 or higher.

 

[mountie]

No more avgas at the marinas?

I used avgas in my 1965 Porsche 356 SC ( early '80's)..... Oh, my.... I swore it was like 2 additional cylinders !!

 

[swathdiver]

I used avgas in my 1965 Porsche 356 SC ( early '80's)..... Oh, my.... I swore it was like 2 additional cylinders !!

Those were cool little cars and great looking too!