Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 - > 2014+ Jeep Grand Cherokee Ecodiesel 3.0

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #73  
Old 02-11-2014, 01:10 AM
Shannon's Avatar
Premium Member
My Jeep: 2014 3.0L WK2
 
Join Date: May 2013
Location: Lakeville, MN
Posts: 1,256
Thanks: 219
Thanked 172 Times in 103 Posts
Rep Power: 9672
Shannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond reputeShannon has a reputation beyond repute
Re: Miles per Gallon

Several things not in your favor. First, winter blend will drop your milage 20 - 30%. Second, the colder it gets, the worse the milage. Lastly, short trips kill the milage in a diesel. Your best fuel economy is when the diesel is warm, and that can take 15+ minutes, especially in the cold.
__________________

__________________
SFU: : 2014 Overland 4X4 EcoDiesel, Billet Silver/Black. ORAII, Adv Tech, Engine Heater, 2000 coats of paint
Picked up 11/14


Current Ride:
2014 Jeep Grand Cherokee Overland Ecodiesel
2007 Wrangler (wife's ride)
2008 20' Four Winns bow rider speed boat
Reply With Quote
  #74  
Old 02-11-2014, 10:39 AM
Member
 
Join Date: Oct 2013
Location: PA
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 472
raptor5618 has a reputation beyond reputeraptor5618 has a reputation beyond reputeraptor5618 has a reputation beyond repute
Re: Miles per Gallon

I think that 13.5 average speed kind of tells the story. However, if your foot is off the pedal and you are going down hill even if the engine is reving you should go up to 99 which is the highest number they show. I would think that even going down hill you would be able to shift. Do you have the button for down hill engine braking on or the transmission shifted into sport or out of automatic?

When I left my house today it was 2 degrees and I checked and my oil temp was 22. After a short flat it is mostly uphill for about 10 minutes until I hit a highway. My oil was only at around 160 when I was getting on the highway and the inside was just starting to warm up. Oh most of that drive the temp outside quickly dropped to -10. I guess my point is that even under the strain of going up hill when it gets down close to zero it takes a good ten minutes for the engine to get close to warm. I do go easy on it but my TDI was the same.

Also it sounds like you are probably sitting at a stand still for a good part of your out and back. I have not done it on this vehicle but on my TDI if it was really cold and I went to the park for lunch I saw that letting it idle was not really going to keep you all that warm because the engine temp at Idle would drop pretty dramatically in a few minutes. In this vehicle I can see the engine temp gauge drop when it is really cold and I am basically costing down some of the longer hills around here. The engine does not get cold but it has dropped a line or two down.

So cold engine and sitting idle and then accelerating well your mileage is going to suck and I think it would suck even worse with a gas engine.

My guess is your mileage is probably about what you are going to get in the cold with winter fuel. I would look into your paddles not working and why you are not getting a 99 reading when you are coasting down hill. I assume you foot is off the pedal.

If you have a longer streach between lights accellerate a little bit harder if you could and then let off the gas. When you coast up to that next light you should see a reading of 99. It takes a few seconds for it to climb up to that number but even on the flat under light acceleration I can often keep it in the 30's.
__________________

__________________
Reply With Quote
  #75  
Old 02-11-2014, 10:55 AM
Premium Member
 
Join Date: Sep 2013
Posts: 233
Thanks: 16
Thanked 5 Times in 5 Posts
Rep Power: 839
Roadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond repute
Re: Miles per Gallon

Quote:
Originally Posted by raptor5618 View Post
However, if your foot is off the pedal and you are going down hill even if the engine is reving you should go up to 99 which is the highest number they show.
Right, my guess is that it is just cold. I see the efficiency hit 99 when coasting on surface roads/highways... just not while going down parking ramps in the few minutes after starting it.

Quote:
I would think that even going down hill you would be able to shift. Do you have the button for down hill engine braking on or the transmission shifted into sport or out of automatic?
No, it won't shift past 2, and HDC/sport/terrain modes are not selected. The odd thing is that if I leave it in D and manage to accelerate enough to get the auto transmission to bump itself into 3rd gear on the ramp, then coasting works the way I would expect: smooth, no engine labor, 75+ mpg instant readout.

I just can't force it into 3rd gear with the shifters *in this scenario*. I can downshift to 1 and then shift back to 2, but it won't allow 3. Just for fun, I am going to see what coasting in neutral does to the instantaneous efficiency readout.

Quote:
Also it sounds like you are probably sitting at a stand still for a good part of your out and back.
It's the stupid synchronized, very long stoplights. I am going to try a longer distance route in the hope that I don't get hit by 4 sequentially-synchronized stoplights in a row that way. No way to beat the lights on my usual path short of stomping the accelerator and getting up to 60 mph in a 35 zone in order to break the cycle. Not that anyone would ever do that.
__________________
Reply With Quote
  #76  
Old 02-11-2014, 11:02 AM
Chivvalry's Avatar
Premium Member
 
Join Date: Nov 2012
Location: Cranberry Twp, PA
Posts: 1,097
Thanks: 181
Thanked 132 Times in 75 Posts
Rep Power: 81069
Chivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond repute
Re: Miles per Gallon

Quote:
Originally Posted by Roadkill View Post
Yes, it does. I doubt the vehicle ever gets up to temp, as that was a typical round-trip separated by a few hours. Also, I wonder if I am almost perpetually in passive regen. I am actually surprised that I haven't seen the active regen warning ever show up. Then again, perhaps not much particulate is accumulating on a day-to-day basis.

I will see if I can conduct the trial you requested later in the week.



So... one might even say that I have the unsurpassed, lowest fuel efficiency for a 3.0 CRD? There's a forum trophy for that, right? 19.75 L/100 km FTW!
I'm in a similar boat (truck?) as you... my commute is fairly short and my mileage from those commutes is sucking. My truck barely gets warmed up and I'm at work already. Mileage on those runs is about 12-15 mpg depending on warm up time. The cold is brutal.

When I make a run into the city it's a 22 mile commute and I get much better mileage then... around 22-24 mpg. I'm also running my oversize tires (265/65r18) at 32 PSI cold and I think that's too low.
__________________
2014 GC Limited CRD Max Steel/Black LuxII ORAII RA4

11/13/13 MINE!! ALL MINE!!!



Reply With Quote
  #77  
Old 02-11-2014, 12:49 PM
Member
 
Join Date: Oct 2013
Location: PA
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 472
raptor5618 has a reputation beyond reputeraptor5618 has a reputation beyond reputeraptor5618 has a reputation beyond repute
Re: Miles per Gallon

I have only used the paddles once and could not get it back into Auto until I went into Neutral and back to drive. Manual says something about moving shifter to the right and unless they mean that button nothing moves right on my shifter. I saw on posts to this site that you have to hold in the + paddle and it will go back but unless you are in an area where you can just keep at the speed you are at I wonder how long it would take. I mostly would use it on long down hills to jump up the revs so I can stay off the brake. I have some hills that have a low speed limit so rather let the engine slow me down than burn out the brakes.

Sucks that your lights are not synchronized so that you get a red light and when you go they change so you get greens for a while as long as you go at the speed limit.
__________________
Reply With Quote
  #78  
Old 02-11-2014, 01:08 PM
Chivvalry's Avatar
Premium Member
 
Join Date: Nov 2012
Location: Cranberry Twp, PA
Posts: 1,097
Thanks: 181
Thanked 132 Times in 75 Posts
Rep Power: 81069
Chivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond reputeChivvalry has a reputation beyond repute
Re: Miles per Gallon

Quote:
Originally Posted by raptor5618 View Post
I have only used the paddles once and could not get it back into Auto until I went into Neutral and back to drive. Manual says something about moving shifter to the right and unless they mean that button nothing moves right on my shifter. I saw on posts to this site that you have to hold in the + paddle and it will go back but unless you are in an area where you can just keep at the speed you are at I wonder how long it would take. I mostly would use it on long down hills to jump up the revs so I can stay off the brake. I have some hills that have a low speed limit so rather let the engine slow me down than burn out the brakes.

Sucks that your lights are not synchronized so that you get a red light and when you go they change so you get greens for a while as long as you go at the speed limit.
To go from paddle shifters back to "normal" just push the button and pull back on the shifter like you are moving from "D"rive to "S"port.
__________________
2014 GC Limited CRD Max Steel/Black LuxII ORAII RA4

11/13/13 MINE!! ALL MINE!!!



Reply With Quote
  #79  
Old 02-11-2014, 01:44 PM
Premium Member
 
Join Date: Sep 2013
Posts: 233
Thanks: 16
Thanked 5 Times in 5 Posts
Rep Power: 839
Roadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond reputeRoadkill has a reputation beyond repute
Re: Miles per Gallon

Quote:
Originally Posted by raptor5618 View Post
Sucks that your lights are not synchronized so that you get a red light and when you go they change so you get greens for a while as long as you go at the speed limit.
It used to be popular for towns to set it up this way to prevent speeding or "cruising" (it's like the opposite of the 'green wave' concept). You stop at a light, wait for it to turn, and if you accelerate normally (or go somewhat over the speed limit) you will arrive at the next light just as it turns red. Also, these stop lights are unconscionably long. In order to break the abusive cycle you have to speed faster than they anticipated was possible... make it past one of the lights and it's smooth, unimpeded progress after that. Or so I hear.

As for the parking ramp, I noticed that coasting in neutral still only got up to 18 mpg. I think the fact of the matter is that the engine consumes some fuel even while idling, and if it is only proceeding at 5 - 7 mph then there is a maximum fuel efficiency that can be achieved.

I think I will just keep accelerating enough to get it into 3rd and coasting that way. At least in 3rd the engine doesn't feel like it is decelerating the vehicle.
__________________
Reply With Quote
  #80  
Old 02-11-2014, 04:40 PM
Member
 
Join Date: Jan 2014
Location: Tulsa area
Posts: 179
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 2034
Rexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond reputeRexlion has a reputation beyond repute
Re: Miles per Gallon

I think they might have programmed the transmission to stay in a low gear when it senses cold temp, because the faster revs generated in the lower gear will more quickly warm up the fluids to normal operating temp. My old Grand Voyager used to do that in cold weather; it would not drop fully into high gear even on the highway until it had gone about 2 miles.
__________________
Reply With Quote
  #81  
Old 02-11-2014, 11:16 PM
ExcursionDiesel's Avatar
Premium Member
My Jeep: 2014 3.0L WK2
 
Join Date: Apr 2013
Location: W. TN.
Posts: 1,450
Thanks: 3
Thanked 201 Times in 135 Posts
Rep Power: 2789
ExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond repute
Quote:
Originally Posted by Chivvalry View Post
To go from paddle shifters back to "normal" just push the button and pull back on the shifter like you are moving from "D"rive to "S"port.
Pull back and hold the upshift paddle for 1 second to return to drive. I too was shifting to Sport and back until I accidentally discovered the right method. Its probably in the manual somewhere.

Also, regarding fuel shutoff while coasting, I am pretty sure this only happens after warmup. I have a Scanguage II that has readouts from the OBDII interface and shows fuel flow in gallons per hour. The cold start fuel flow rate is 0.82 gph at idle. Coasting at a slow speed would yield a fairly low mpg when cold.

Today, after mine warmed up, the fuel flow rate went to 0.0 gph when I was coasting. I found that interesting. Perhaps the rich condition helps the cold motor run better. Its amazing how smooth the VM3.0 runs in cold weather! My Powerstroke shakes and rattles violently for a minute or two if its below 15°F.
__________________
----------------------
The founder of JeepGarage.org, Scottina06, has a son Max who is in need of corrective surgery from an infection at birth that left one leg 4 inches short. We need to support our Jeep brothers. His family has started a fund on giveforward.com. If you have ever been helped by someone else, now is a good time to pay it forward. Here is a link to that page. God bless you! http://gfwd.at/1rz33PW
Reply With Quote
  #82  
Old 02-11-2014, 11:41 PM
ExcursionDiesel's Avatar
Premium Member
My Jeep: 2014 3.0L WK2
 
Join Date: Apr 2013
Location: W. TN.
Posts: 1,450
Thanks: 3
Thanked 201 Times in 135 Posts
Rep Power: 2789
ExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond reputeExcursionDiesel has a reputation beyond repute
Quote:
Originally Posted by Roadkill View Post
As for the parking ramp, I noticed that coasting in neutral still only got up to 18 mpg. I think the fact of the matter is that the engine consumes some fuel even while idling, and if it is only proceeding at 5 - 7 mph then there is a maximum fuel efficiency that can be achieved.
Bingo! See my previous post.
Quote:
I think I will just keep accelerating enough to get it into 3rd and coasting that way. At least in 3rd the engine doesn't feel like it is decelerating the vehicle.
The new 8 speed is programmed to engine break instead of coasting like older automatics. This is a new trend intended to reduce brake wear. You can shift to neutral on long hills if you want maximum coasting. No need to press the lockout button on the shifter either. It will go to neutral without the button press and can't go to reverse accidentally. Its easier than using the paddles too. In a parking garage, you are turning the wheel a lot anyways and the paddles are hard to find!

BTW, diesels have less engine braking than gas motors so you may have noticed that going down steep hills produces higher rpms. This is due to the lack of a throttle plate to create a vacuum and slow the engine down when engine breaking.
__________________
----------------------
The founder of JeepGarage.org, Scottina06, has a son Max who is in need of corrective surgery from an infection at birth that left one leg 4 inches short. We need to support our Jeep brothers. His family has started a fund on giveforward.com. If you have ever been helped by someone else, now is a good time to pay it forward. Here is a link to that page. God bless you! http://gfwd.at/1rz33PW
Reply With Quote
  #83  
Old 02-12-2014, 08:49 AM
Member
 
Join Date: Oct 2013
Location: PA
Posts: 122
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 472
raptor5618 has a reputation beyond reputeraptor5618 has a reputation beyond reputeraptor5618 has a reputation beyond repute
Re: Miles per Gallon

I have read about using the paddle but got the impression that you had to hold it for a while. Tried it last night and it went back to drive fairly quick so it is an option. Think it would be an issue if you are going anything other than straight. Using the shifter sounds like the the easiest and quickest way to go. Do paddles work either way. Seems like when I went to take it out of manual I had to pull it toward me and I could not push it forward.

Interesting that the fuel would still flow when it is cold. I have to believe that is so the engine does not cool down too much when going down a long hill with no acceleration. This engine temp drops but not nearly as much as my older TDI which probably still pumped fuel but that small engine would lose heat in a hurry. I am thinking that this is why my MPG is really significantly less when it is really cold. This week has been close to zero in the AM and maybe 20 on the way home but often less and my average is below 25. The week I drove in the 30's it was easy to keep it above 27. I also noticed that I cannot change my average on the way to work which is generally uphill but often by the end of the 50 mile commute my average would have gone up. The last two days where it was sub zero I either kept a reading of 24.5 or there abouts and today I think it even went down during my -8 degree commute.

Also I am sure this vehicle is like the TDI and I think it even states it in the book that if you coast in Neutral you will be using fuel to turn the engine. I noticed yesterday that taking my foot off the pedal when I was going slow did not result in a quick 99 but a reading of 55 or so that crept up but very slowly and well I only was doing this for a short time but in light of earlier posts I guess the engine consumes fuel when it is really cold.

On my previous vehicles winter fuel only dropped my average by around 10% on my 2000 TDI and probably less than 5% on the 2012 which had all the green technology stuff and was a bigger engine. Granted I do not recall an extended time where I drove in temps this cold this often. So I assume that when the temp climbs I should be back in the 28's and with summer fuel I honestly think I will be getting in the 30's. If that proves to be true I will be ecstatic.
__________________
Reply With Quote
  #84  
Old 02-12-2014, 09:21 AM
wraab's Avatar
Premium Member
My Jeep: 2014 3.0L WK2
 
Join Date: Dec 2013
Location: Houston, Tx
Posts: 180
Thanks: 13
Thanked 4 Times in 4 Posts
Rep Power: 431
wraab is on a distinguished road
Re: Miles per Gallon

I finally was able to do hand math vs EVIC on this tank of gas. It was 21.1 vs 21.5. I only got 462 miles out of the tank and was past the DTE (it read just low fuel which is below 40). That's with 75% city driving.

As for the poster with the horrid MPG - I can say that when I filled up last night and drove home and then drove to the gym this morning (4 miles total) I was at 13mpg. After coming to work, which is about 9 miles, my MPG is up to 19mpg.
__________________

__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
60 miles and ..... Saudi.SRT8 Trouble Shooting/Problems/Service 7 09-10-2013 05:20 PM
Miles per gallon help nickmuller Performance Modifications 21 02-24-2013 03:39 PM
post ur best miles per gallon drdlcks1 Grand Cherokee - WK 42 09-22-2010 01:24 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 12:11 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community