**3 Classes of E85 Blends Offered in a Particular Area**

[SVT03Chris]

Kev, possibly make this a sticky? Pretty good info

Summer Blend: Class 1 (min 79% ethanol)
Spring/Fall Blend: Class 2 (min 74% ethanol)
Winter Blend: Class 3 (min 70% ethanol)

E85 Mustangs.com - Regional Fuel Chart by state

 

[kmadona]

Are there many ethanol stations in Ok? I haven't seen any in the New Orleans area. What boost are you runnning with the 2.2?

 

[stkjock]

Nice find.

 

[04sleeper]

Chris. I have not found those to be consistent with testing.

 

[da2k17]

so is this legit? it makes me nervous reading some of that as im going to do an e85 tune soon but it seems like it would be a PITA to find out which fuel your actually using.

 

[stkjock]

so is this legit? it makes me nervous reading some of that as im going to do an e85 tune soon but it seems like it would be a PITA to find out which fuel your actually using.

It's not get a tester for like $20 and you can test at each fill up in a few minitues.

 

[GodStang]

Chris. I have not found those to be consistent with testing.

so is this legit? it makes me nervous reading some of that as im going to do an e85 tune soon but it seems like it would be a PITA to find out which fuel your actually using.

That is the same chart from the Department of Energy site. Saw it a few years ago. The thing is it will not be consistent at all. The problem is if a station fills up in January but very few cars come and get E85 from that station. They may not refill for 2 months and the fuel added my be a different blend. So depending on the place it could be 3/4 class 3 and 1/4 class class 1. Meaning it does not agree with the chart. The ONLY way to know is get one of the testers from summit and test what you are getting.

 

[da2k17]

what is the difference in octane in the different blends?

 

[JustaGT]

So if I'm going E85, I'm going to have to test my fuel every single time I fill up or else I could risk problems? The only way I could actually test it before its to late is to purchase the fuel and put in another container then test it and put it in my car? Kind of a PITA if you ask me.

 

[GodStang]

So if I'm going E85, I'm going to have to test my fuel every single time I fill up or else I could risk problems? The only way I could actually test it before its to late is to purchase the fuel and put in another container then test it and put it in my car? Kind of a PITA if you ask me.

No not every time but it is a good idea to test every so often.

 

[SVT03Chris]

So if I'm going E85, I'm going to have to test my fuel every single time I fill up or else I could risk problems? The only way I could actually test it before its to late is to purchase the fuel and put in another container then test it and put it in my car? Kind of a PITA if you ask me.

No reason to test it every single fill up if you're going to the same station. I would just test it a few months out of the year, in different seasons.

 

[JustaGT]

No reason to test it every single fill up if you're going to the same station. I would just test it a few months out of the year, in different seasons.

Okay gotcha. Thats more feasible

 

[04sleeper]

Also, even if it goes to a Winter Blend, the A/F will just run a bit richer. It won't hurt performance.

 

[stkjock]

So if I'm going E85, I'm going to have to test my fuel every single time I fill up or else I could risk problems? The only way I could actually test it before its to late is to purchase the fuel and put in another container then test it and put it in my car? Kind of a PITA if you ask me.

Get tuned on true E85 and you will be fine no matter the blend. A lower ethanol blend will halve you run rich and be safe.

You can test it before you fill up. Just rbi ng your tester and a small bottle or cue tp put some fuel in first to test. I've been doing just that.

 

[speeddemon2000]

Get tuned on true E85 and you will be fine no matter the blend. A lower ethanol blend will halve you run rich and be safe.

You can test it before you fill up. Just rbi ng your tester and a small bottle or cue tp put some fuel in first to test. I've been doing just that.

If it's running rich could it cause the cylinder walls to wash down and cause an issue there?

 

[stkjock]

If it's running rich could it cause the cylinder walls to wash down and cause issue there?

Not as I understand it. You are not getting the rich condition due to more fupr being dumped in, it's because of the change in the stoich of the lower blend vs the higher blend.

 

[04sleeper]

Not as I understand it. You are not getting the rich condition due to more fupr being dumped in, it's because of the change in the stoich of the lower blend vs the higher blend.

Correct. And the change is not significant enough to make anything like that happen.

 

[drewkeen]

Wouldn't closed loop also adjust some to keep it stoich as well for most of you driving?