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Old 04-08-2013, 11:23 AM   #1
GR34TWHI73N0RTH
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E85 mix

Does anyone have experience running an 20% E85: 80% 91 mix in a non ffv. Im getting some cold plugs today and going to give it a try since gas at 87 has some ethonol and 91 has almost none, mixing 20% the engine should be able to handle it. My old jeep i put a 40:60 mix and it was before the whole ffv fad and had no problems at all(but that car was a tank and had after market cold plugs). What has been your experience? (If you haven't done it or are not FoMoCo don't even post, these threads just turn into opinion arguments)


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Old 04-09-2013, 10:19 AM   #2
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Why would it cause an issue? The car runs fine from E0 to E85. It will have no trouble running any mixture in-between.

I've many times run 5 gallons of E85, topped off with 87 octane E10. It runs great, and has a noticeable improvement in performance over the 89 octane E10 I usually run. MPG will, of course, suffer.

BTW, what blend is the 91 octane fuel you're mixing with? (E0? E10?) Pretty much everything is E10 around here, regardless of octane.
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Old 04-09-2013, 11:38 AM   #3
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Do you have a flex fuel vehicle? Many cars are not. My Focus is not flex fuel and the ring around the fuel fill clearly states not to use E85. I wouldn't even try mixing E85 and 91, even if E85 was available in my area.
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Old 04-09-2013, 12:15 PM   #4
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Thanks Tbone yeah that's what i thought just wanted reassurance, well its chevron 91oct so im not sure of the mix ratio's but I'm mixing in 20% e85 going to give it a test ride. If its anything like other vehicles its going to run much nicer. It would almost be like a e20 when its mixed. Which is gasohol and cars down is South and Central America run mainly on that mix.

BrApple all gasoline has some ethanol in it just depends on how much based on what state you live in and the companies mixes, they just put the tag there cause they don't want some dumb ass to do 100% pure ethanol without the proper upgrades to do so. new plugs, proper fuel injectors(the originals will work to a point) ...etc. Any internal combustion engine can run off ethanol, just depends on how efficient it is at doing so.

Just so you can have an idea Ethanol Chart
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Old 04-09-2013, 03:11 PM   #5
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Quote:
Originally Posted by GR34TWHI73N0RTH View Post
Any internal combustion engine can run off ethanol, just depends on how efficient it is at doing so.
While that may be true, not all fuel systems are designed with ethanol in mind, and may have parts that will oxidize when in contact with ethanol. You are taking a chance with this if your vehicle is not E85 approved.

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Originally Posted by GR34TWHI73N0RTH View Post
BrApple all gasoline has some ethanol in it just depends on how much based on what state you live in and the companies mixes
E0 is still available in the US and contains no ethanol.
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Old 04-09-2013, 03:28 PM   #6
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If your car is not flex fuel, it cannot run anything over e15. The flex fuel cars have a sensor that detects ethanol content and adjusts fueling to make up for the increase needed for E85. OP said he has a non FFV car, so he could run into issues if the car cannot enrich the fueling enough.
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Old 04-09-2013, 03:30 PM   #7
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Quote:
Originally Posted by GR34TWHI73N0RTH View Post
Thanks Tbone yeah that's what i thought just wanted reassurance, well its chevron 91oct so im not sure of the mix ratio's but I'm mixing in 20% e85 going to give it a test ride. If its anything like other vehicles its going to run much nicer. It would almost be like a e20 when its mixed. Which is gasohol and cars down is South and Central America run mainly on that mix.

BrApple all gasoline has some ethanol in it just depends on how much based on what state you live in and the companies mixes, they just put the tag there cause they don't want some dumb ass to do 100% pure ethanol without the proper upgrades to do so. new plugs, proper fuel injectors(the originals will work to a point) ...etc. Any internal combustion engine can run off ethanol, just depends on how efficient it is at doing so.

Just so you can have an idea Ethanol Chart
E10 is a gasahol, technically any Ethanol cocentration above 0% is considered a gasahol in fact. However running it in a car that was not designed to take higher concentrations of Ethanol fuel is asking for disaster.

In order to get to slightly over 20% ethanol concentration you would need to blend in 2 gallons of E85 with 10.4 gallons of E10 fuel assuming that the fuels carried their nominal ethanol concentrations and the fuel tank of the MK3 being exactly 12.4 gallons.

2 gallons of E85 contains 1.7 gallons of ethanol, 10.4 gallons of E10 contains 1.04 ethanol, for a total of 2.74 gallons/ tank which leaves the other 9.66 gallons of gasoline for an over all concentration of 22.1%.

If you do end up having fuel systems issues it won't be covered by any warranty due to your misfueling of the vehicle if it was not a flex fuel model, but that's a risk you'll have to decide if its worth it.
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Old 04-09-2013, 04:13 PM   #8
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I've been using E30 in a 1995 Ford Aspire for 10.5 years with no issues. Yesterday when I filled up the mileage check was 36.7 mpg and that is many short trips---non over 10 miles. The little car really likes that blend.
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Old 04-09-2013, 06:07 PM   #9
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Quote:
Originally Posted by GR34TWHI73N0RTH View Post

BrApple all gasoline has some ethanol in it just depends on how much based on what state you live in and the companies mixes,
Yes I am aware that most gas is E10 and it can vary by location. Here in CT everything is E10.

I was just saying I would not use E85 and mix it because Ford states that I should not be using E85 in my car.
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