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Old 07-12-2014, 04:08 PM
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My Experience with E85 and V6

Wanted to try out the E85 to see exactly how bad of a mileage hit it really is. Some of the stories have been almost unbelievable so I wanted to see for myself. I use my Jeep mainly to get back and forth to work, exactly the same route, same speeds.

My vehicle is a 2014 4x4 Altitude
After just over 2000 miles using plain old E10 87 Octane gas it averaged 22.9mpg (about 3/4 freeway)

Last 2 tanks of gas are on E85 and it is currently averaging 18.9. or a hit of ~18% lower mileage

In SE Wisconsin, the E85 is currently heavily subsidized for some reason and is almost always exactly $1 per gallon cheaper than 87.

So per mile cost @$3.69/gal for E10 is 0.16.1 cents
per mile cost @2.69/gal for E85 is 14.2 cents

So at this point if it continues to be cheaper to run E85 even with the mileage hit. Anybody have similar experience or similar price difference in their area?

*Ill add in that this is a Lease vehicle and I am not a big supported of Gov't subsidized products. The purpose was to just see for myself what the actual effects of E85 are on the '14 GC V6.
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Old 07-12-2014, 04:15 PM
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Re: My Experience with E85 and V6

I'm in western WI and E85 (where you can find it) at best is $0.25-0.30 a gallon cheaper.

It not only delivers poorer fuel economy, it also reduces engine power.

Frankly, I wouldn't burn that crap in my vehicle if I could get it for free. It's one of the biggest jokes ever foisted on the American public.

I'm also going to add...

Whenever I go to the Milwaukee area, I never buy fuel east of Johnson Creek due to the reformulated gas policy you guys have.
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Old 07-13-2014, 07:22 AM
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Re: My Experience with E85 and V6

Well I am definitely out of luck buying gas for the most part outside of SE Wisconsin.... I have not noticed any reduction of engine power or any sort of hesitation or rough idle either. So far its been a non-event other than the loss of about 4 mpg.
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Old 07-13-2014, 07:48 AM
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Re: My Experience with E85 and V6

The next time you're at your dealer, walk the new car lot and look for a sticker on the windshield explaining what you can expect to see mileage/power wise when burning regular vs E85. A few years ago the only place you'd find this info was buried in the small print footnotes of a brochure.

If you don't tow you may not notice the drop in power. Ask anyone who does who've tried E85.
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Old 07-13-2014, 08:52 AM
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Re: My Experience with E85 and V6

Was there any noticeable difference in acceleration?


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Old 07-13-2014, 12:06 PM
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Re: My Experience with E85 and V6

Here is the link for the 2014 GC fueleconomy.gov:

Gas Mileage of 2014 Jeep Grand Cherokee

2014 Jeep Grand Cherokee 4WD 6 cyl, 3.6 L, Automatic 8-spd, Regular Gas or E85:
Gas: 17 City, 19 Combined, 24 Highway
E85: 13 City, 15 Combined, 18 Highway

So, EXACTLY a 4 MPG Combined loss using E85 just as you experienced. A 4 MPG loss in City only too and a whopping 6 MPG loss on Highway, ouch!
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Old 07-13-2014, 03:30 PM
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Re: My Experience with E85 and V6

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Old 07-14-2014, 01:35 PM
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Re: My Experience with E85 and V6

The only station near me sells it for 18 cent less than E10. Thus, I will never try it.
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Old 07-14-2014, 03:22 PM
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Two things.

First, I've never heard anyone say ethanol will give you LESS power.

Second, if someone is trying to stay away from govt subsidized things then you will never buy anything.
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Old 07-14-2014, 03:31 PM
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Re: My Experience with E85 and V6

Ethanol has far less BTUs per gallon than gasoline without ethanol. Also, ethanol absorbs water from the air and can cause much more fouling inside the engine. Trying to get the least amount of ethanol in your fuel is your best bet. I had a car previously that I tried E85 in and the mileage dropped over 20%. That was the last time I ever tried it.
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Old 07-14-2014, 03:40 PM
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Ethanol will get you less mpg's, but costs less, that's the compromise. Everyone knows that.

Ethanol hadt a lower ignition temperature, thus engine runs cooler and burns slower giving a more even piston stroke, more power.
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Old 07-14-2014, 03:44 PM
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Re: My Experience with E85 and V6

Here is a good article and some data behind gasoline vs ethanol blends for the threads suggested reading.
Gasoline vs Ethanol
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