Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK2 -

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 11-30-2012, 02:40 PM
Member
 
Join Date: Nov 2012
Posts: 28
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 739
mufugger is on a distinguished road
Break-in MPG?

Hey everyone,

This is now my 3rd JGC. Started with a 2000, then a 2008, now in a 2013 black overland with saddle. LOVE it so far.

My only issue, 900 miles later is I'm getting terrible MPG's. In my 2008 4.7, I could get between 20-23 on the highway depending on whether I was going 65ish or 85ish.

With my 2013 5.7, I average about 17 or so highway, regardless of speed. I try hard to feather the throttle and trigger ECO mode as much as possible, but I can never get close to averaging the advertised 20 on highway.

Does it get better after break in? I know there's a lot of postings about this..but I guess I'm curious if this is what I should expect out of this vehicle, or if it will get better after break-in. Any thoughts/comments appreciated and welcome!
__________________

__________________
Reply With Quote
  #2  
Old 11-30-2012, 02:58 PM
ColdCase's Avatar
Senior Member
 
Join Date: Apr 2011
Posts: 1,446
Thanks: 0
Thanked 27 Times in 26 Posts
Rep Power: 26502
ColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond reputeColdCase has a reputation beyond repute
Re: Break-in MPG?

I saw a small increase at about 5000 miles. You need to use cruise control to get the best mileage. Fuel now days has so much more ethanol and perhaps water in it from time to time and station to station that its hard to make consistent comparisons.
__________________

__________________
2011 WK2 Overland Mineral Gray/Black, Advanced warning, V8; 2009 KK Rocky Mtn V6; 2000 WJ Laredo I6; 1979 CJ7 I6... green... miles of smiles :)
Reply With Quote
  #3  
Old 11-30-2012, 03:00 PM
SnoFire's Avatar
The Negotiator
My Jeep: 2014 3.6L WK2
 
Join Date: Jun 2011
Location: Wisconsin
Posts: 4,889
Thanks: 55
Thanked 136 Times in 115 Posts
Rep Power: 390088
SnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond repute
Garage
Re: Break-in MPG?

I know in my wifes Hyundai that once you get over 80mph she isn't in ECO mode anymore.
__________________
Reply With Quote
  #4  
Old 11-30-2012, 03:14 PM
GBJeep's Avatar
Premium Member
My Jeep: 2011 5.7L WK2
 
Join Date: Apr 2012
Location: Louisiana
Posts: 1,349
Thanks: 2
Thanked 23 Times in 22 Posts
Rep Power: 1416380
GBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond reputeGBJeep has a reputation beyond repute
Re: Break-in MPG?

I have owned mine a little over a year now and the mileage is not as advertised. Very happy with my Jeep, but this also depends on how much highway driving you do.
__________________
Reply With Quote
  #5  
Old 11-30-2012, 03:23 PM
Member
 
Join Date: Oct 2012
Posts: 48
Thanks: 1
Thanked 0 Times in 0 Posts
Rep Power: 781
sly1types is on a distinguished road
Re: Break-in MPG?

I only have 2900 miles so I may not be the best source...

I got a little better now than when It did with less than 1k on it. I even got a highway tank at 17.5 mpg driving 78-80mph.

I have got 19-20, but I was only going 60-65 and trying to keep the eco light on.

Like someone else said I don't think the mileage is as advertised, but ohh well I really like the Jeep in all the other aspects.
__________________
2013 Grand Cherokee
Hemi, Nav, Leather
20's Quadra Track 2
Reply With Quote
  #6  
Old 11-30-2012, 03:46 PM
Member
 
Join Date: Nov 2012
Posts: 28
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 739
mufugger is on a distinguished road
Re: Break-in MPG?

The thing that boggles my mind is that my 2008 4.7 was advertised at 19mpg highway. My 2013 5.7 was advertised at 20mpg, yet the highway mileage is worse? That's a bummer.

I love my new jeep, but that definitely seems a little bit misleading.
__________________
Reply With Quote
  #7  
Old 12-01-2012, 03:45 PM
Member
My Jeep: 2013 3.6L WK2
 
Join Date: Nov 2012
Location: Oregon
Posts: 51
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 751
glassmtn is on a distinguished road
Re: Break-in MPG?

Have you checked fuelly.com? I imagine the V8s are somewhat accurate for overall mileage as they should all be 4x4s. The V6s may have some 2x4s mixed it.

eric.
__________________
Reply With Quote
  #8  
Old 12-01-2012, 03:55 PM
JTS97Z28's Avatar
Premium Member
My Jeep: 2012 3.6L WK2
 
Join Date: Jan 2011
Location: Plainfield, IL
Posts: 1,452
Thanks: 0
Thanked 29 Times in 19 Posts
Rep Power: 25211
JTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond repute
Send a message via AIM to JTS97Z28
Re: Break-in MPG?

I have logged every fuel fill up in my 2012 Overland V6 since new. I know you have the V8, but for what its worth I did not see much change in fuel economy from new to current mileage of 9,200 miles. I assume newer motors are built where things don't need to "loosen" up like they used to. Expect minimal changes at best. The Hemi is a great engine, but its not going to be spectacular on fuel economy so don't think your going to be getting 20mpg around town after some miles because you wont. It may improve some, but it wont be significant.
Good luck with the new Jeep and enjoy that thing, they are amazing vehicles!

James
__________________
Reply With Quote
  #9  
Old 12-01-2012, 04:00 PM
SnoFire's Avatar
The Negotiator
My Jeep: 2014 3.6L WK2
 
Join Date: Jun 2011
Location: Wisconsin
Posts: 4,889
Thanks: 55
Thanked 136 Times in 115 Posts
Rep Power: 390088
SnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond reputeSnoFire has a reputation beyond repute
Garage
Re: Break-in MPG?

Hopefully your not using E85... If you even can?!?
__________________
2014 GC Limited V6 LuxII/Tow/RA4 Max Steel/Blk Michelin LTX M/S2

Reply With Quote
  #10  
Old 12-01-2012, 04:53 PM
Member
 
Join Date: Feb 2012
Location: Colorado Springs, CO
Posts: 83
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 1077
avalys is on a distinguished road
Re: Break-in MPG?

Tire pressures make a huge difference. The recommended Jeep factory pressures on my Overland with the ORA II package were 33 psi front and rear (18" tires). That's pretty low. I have been running 36 or 37 psi and it seems to do much better.

Remember that those are cold pressures. If you have to drive even a few miles to get to a filling station, your tires will not be cold. Tire pressure changes by about 1 psi with each 10 degF. It is hard to judge tire temperature with your hand. Best approach, if you don't have a compressor, is to measure the tire pressure before leaving and then make a note of how many pounds you need to add to each tire, and then add that much when you get to the gas station regardless of how the pressure's changed once you get there.

Similarly, if you fill up your tires with a compressor after the car has been sitting all night in your inside your 60F attached garage, and then go out driving in 30F weather, you will be down by 3 psi once the tires cool.
__________________
Reply With Quote
  #11  
Old 12-01-2012, 06:09 PM
Member
 
Join Date: Nov 2012
Posts: 28
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 739
mufugger is on a distinguished road
Re: Break-in MPG?

You ain't kiddin about the tire pressure. I went out and saw all 4 tires were at 33psi. I have the 20" rims, the max psi is 51! That's how it came from the dealer..Filled up all four tires to ~50psi and went for a spin.

I did about 8 miles on the highway at 60ish and averaged about 26mpg! What a difference. That same stretch would have netted me about 17mpg before filling up the tires.

Thanks for the thought, what an amazing difference.
__________________
Reply With Quote
  #12  
Old 12-01-2012, 06:48 PM
JTS97Z28's Avatar
Premium Member
My Jeep: 2012 3.6L WK2
 
Join Date: Jan 2011
Location: Plainfield, IL
Posts: 1,452
Thanks: 0
Thanked 29 Times in 19 Posts
Rep Power: 25211
JTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond reputeJTS97Z28 has a reputation beyond repute
Send a message via AIM to JTS97Z28
Re: Break-in MPG?

Quote:
Originally Posted by mufugger View Post
You ain't kiddin about the tire pressure. I went out and saw all 4 tires were at 33psi. I have the 20" rims, the max psi is 51! That's how it came from the dealer..Filled up all four tires to ~50psi and went for a spin.

I did about 8 miles on the highway at 60ish and averaged about 26mpg! What a difference. That same stretch would have netted me about 17mpg before filling up the tires.

Thanks for the thought, what an amazing difference.


Uhhh, you filled your tires to 50psi?

Please put them down to the recommended 36psi for the 20" wheels. DO NOT run at the max designed PSI rating...for the your safety and others. That means when your tires warm up your pushing probably 53+ psi. Not good!
__________________

__________________
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
Break into the 13's with a 5.7 Hemi WK Omegax1 Performance Modifications 17 04-15-2013 11:49 PM
Break in Darth Vapor SRT Grand Cherokee - WK2 - 8 09-21-2012 11:07 PM
You better break in your TC right!! mr.jason Grand Cherokee SRT - WK2 4 05-25-2012 12:22 PM
Break in? HOOCH Grand Cherokee - WK2 - 12 03-22-2012 09:12 AM
Break-in period bronzyel Grand Cherokee SRT - WK2 3 03-04-2012 09:49 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 04:37 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

JeepGarage.org is in no way associated with or endorsed by Chrysler Group LLC.