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  #13  
Old 03-18-2014, 02:35 PM
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Re: MPG better with ECO OFF?!

I wonder what the temp was for each test. I always have eco on but when the temp drops below freezing and especially down into the teens my mileage drops significantly. I have the same 100 mile commute that is mostly highway and when it is in the 40's I can get it to run up almost to 29 over the course of a single day. If the temp starts around 10 and never gets above freezing it is difficult to get much above 26.

I did notice that when it is cold and you take your foot off the pedal the instantaneous takes a while to go to 99 and in city driving it often goes the other way as you slow at a stop sign or stop light. Also it is very difficult to even get the instantaneous above 26 when you are cruising on flat ground.

My other diesel did not vary all that much in the cold and I tracked them the same way I am tracking this one, and my averages reflect what the EVIC is saying although not a direct match if it shows a lower average it is reflected at the pumps.
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  #14  
Old 03-18-2014, 02:43 PM
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Re: MPG better with ECO OFF?!

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Originally Posted by bill_de View Post
I press 3 buttons when I get in the Jeep in the morning; garage door, start, eco off. I try to remember to turn it back on if I will be on the highway for a while.

Although there was some improvement after one of the TSBs, at low speeds the MDS still kicks in too soon, and subsequently too often.


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Old 03-18-2014, 07:47 PM
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Re: MPG better with ECO OFF?!

I've noticed the largest variance is in fuel. Not stations so much as which tank-load I end up with. Not sure if there are variables between 'winter blends' or not...but I can run the same route, similar temps, with fuel from the same station...and have vastly differing MPG because the station has had to refill their underground tanks - presumably with a different concoction.

I can't wait for winter blend to go away for the season, so I can see what this thing can REALLY do!!
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Old 03-18-2014, 11:46 PM
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I actually just noticed this yesterday while driving on the highway. I turned sport on/eco off because the shifts seem smoother in stop and go traffic and ended up leaving sport on the whole trip home and I noticed an increase in MPGs. Interesting...
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Old 03-19-2014, 07:43 PM
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I tried it today on highway

Not really seeing difference at all
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Old 03-19-2014, 10:48 PM
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Re: MPG better with ECO OFF?!

I drove with the eco mode off today and the EVIC showed about 1-2 MPG difference and even hit 33 MPG at 55 MPH on a virtually level section of freeway.

I turned it off once during the first two weeks and it didn't feel any different and today it felt like the acceleration was much better even though I was just trying to drive normally. I'll keep turning it off for a while so I can calculate my mileage at fill-ups to see how much it actually changes.
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Old 03-21-2014, 06:16 PM
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Re: MPG better with ECO OFF?!

IMO the shifting is crap in eco and I turn it off not long after I start rolling. I've tried to give it a go a number of times but the mode is just too relentless in its pursuit of destroying proper shift points. Since I did this from about 30 minutes after delivery I don't have any tanks of fuel on eco but I can say actual measured fuel economy has been better than rated so far despite saying no to eco.
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Old 03-24-2014, 08:55 PM
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Re: MPG better with ECO OFF?!

Took a 800-mile road trip to watch my NDSU Bison play in the NCAA bball tourney and left the eco mode off the entire route. Hand calculated mileage was 28.5 MPG which includes about 20 miles of crawling along at 0-20 MPH in rush hour traffic, maybe 30 miles of driving in town, and the rest on freeway/highway at 65-75 MPH. The EVIC said 29.5 for the round trip. That's still a little better than the EPA estimate for 4WD.

I reset the trip odometer for about 100 miles on I-84 which is fairly level with a net elevation change of about 300 ft and the EVIC said 31 MPG on that stretch.
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Old 03-24-2014, 09:32 PM
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Quote:
Originally Posted by Diesel27 View Post
I actually just noticed this yesterday while driving on the highway. I turned sport on/eco off because the shifts seem smoother in stop and go traffic and ended up leaving sport on the whole trip home and I noticed an increase in MPGs. Interesting...
Tailwind, downhill, warmer weather, different fuel, some other reason.....I doubt, once underway in 8th gear, that Sport or ECO on or off would change fuel delivery at the same RPM. Interesting observation though. I will watch instantaneous fuel flow on my OBDII monitor tomorrow while switching modes on a flat highway cruise to see what's going on.
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Old 03-25-2014, 02:05 PM
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Re: MPG better with ECO OFF?!

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Originally Posted by MDBones View Post
I've noticed the exact opposite on mine. Better with eco on.

I should also note that I don't run in eco with the sub-zero weather we've had. I prefer to keep the rpm's up a little more when it's like that and the cold weather drops the mileage regardless of what mode I'm in.

MD - is yours a diesel or a 3.6 V6? ECO might work better with the 3.6 than with the 3.0.
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Old 03-28-2014, 10:16 PM
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Re: MPG better with ECO OFF?!

Quote:
Originally Posted by bill_de View Post
I press 3 buttons when I get in the Jeep in the morning; garage door, start, eco off. I try to remember to turn it back on if I will be on the highway for a while.

Although there was some improvement after one of the TSBs, at low speeds the MDS still kicks in too soon, and subsequently too often.


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MDS - on the Ecodiesel? That's news to me - thought that was just on the hemi??
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Old 03-28-2014, 11:32 PM
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Re: MPG better with ECO OFF?!

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Originally Posted by ferntree View Post
MDS - on the Ecodiesel? That's news to me - thought that was just on the hemi??
He's rocking the hemi. I think he just likes to wander into our forums and have a look. See for him its kinda like walking into the dressing room back behind the walk where all the supermodels are changing into their next outifit when he comes in here.
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