12.5 Average MPG? - Page 4 - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WK Grand Cherokee & XK Commander Forum > 12.5 Average MPG?

ECGS Black Friday Sale!!6th Annual, Beat Your Wife to the Credit Card Sale!50 in light bar /A pillar mount less than 500 at JeepHut.c

Reply
Unread 07-03-2012, 04:17 PM   #46
Shafer57
Registered User
2006 WK 
 
Join Date: Sep 2011
Location: delran, nj
Posts: 679
Already have it. Tried MPG booster for the past 2 months with no success. Hense my reason for concern

__________________
Dodge Dakota R/T 360ci Small-block _sold_
Jeep GC 5.7L Hemi- Magnaflow Cat-Back, BT Catch Can, 20" Gloss black SRT Reps
275/45R20 Nexen Roadian, Blacked out, 180 Stat _SOLD_
2008 335i Twin-Turbo
Shafer57 is offline   Reply With Quote Quick reply to this message
Unread 07-03-2012, 04:44 PM   #47
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by Shafer57
Already have it. Tried MPG booster for the past 2 months with no success. Hense my reason for concern
Pick ur foot up a lil then use cruise control a lot leave mds on if u custom tune. As far as mods on my Jeep I have no muffler k&n drop in and I run the 87oct tune.. I said mileage booster that's was my mistake that tune didn't help me either
tmidz87 is offline   Reply With Quote Quick reply to this message
Unread 07-03-2012, 04:47 PM   #48
Shafer57
Registered User
2006 WK 
 
Join Date: Sep 2011
Location: delran, nj
Posts: 679
I really don't get on it often. Maybe once a tank to get onto a major highway, but rarely drive above 3000 RPM.

Bottom line: Some maintenance needs to be addressed, then go from there
__________________
Dodge Dakota R/T 360ci Small-block _sold_
Jeep GC 5.7L Hemi- Magnaflow Cat-Back, BT Catch Can, 20" Gloss black SRT Reps
275/45R20 Nexen Roadian, Blacked out, 180 Stat _SOLD_
2008 335i Twin-Turbo
Shafer57 is offline   Reply With Quote Quick reply to this message
Unread 07-03-2012, 05:04 PM   #49
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by Shafer57
I really don't get on it often. Maybe once a tank to get onto a major highway, but rarely drive above 3000 RPM.

Bottom line: Some maintenance needs to be addressed, then go from there
Read ur owners manual just skimming through mine I found out that the m.d.s. requires 5w20 and they strongly recommend running a certain plug in it as well.. I'm told the systems on the hemi are very specific on what they need (jeep tech)
tmidz87 is offline   Reply With Quote Quick reply to this message
Unread 07-03-2012, 05:08 PM   #50
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by Shafer57
I really don't get on it often. Maybe once a tank to get onto a major highway, but rarely drive above 3000 RPM.

Bottom line: Some maintenance needs to be addressed, then go from there
My wife is a prime example in my jeep When she drives it. I check it when I get in and its always 14.x. its all in how hard u push the pedal when u pull out. Try it I might take forever to get up to the speed posted but I'm pinching nickels doing it
tmidz87 is offline   Reply With Quote Quick reply to this message
Unread 07-05-2012, 02:22 PM   #51
andrew44
Registered User
2005 WK 
 
Join Date: Apr 2012
Location: coeur d alene, ID
Posts: 142
Quote:
Originally Posted by Shafer57 View Post
I really don't get on it often. Maybe once a tank to get onto a major highway, but rarely drive above 3000 RPM.

Bottom line: Some maintenance needs to be addressed, then go from there
well like everyone has mentionedlugs,Air filter,pcv valve,EGR, exhaust sensors, TB Clean,good oil, good gas, maybe injector cleaner?, proper tire inflation,correct alignment, correct size(factory) tires.
__________________
05 WK GC Limited 4.7L Nitto trail grapplers 285/70/17 RR 2.25" Bilstien Shocks. RC 1.5" Wheel Spacers. deck and 10" sub. HID8000 Head lights. Superchips Flash Paq. 22" stainless Magnaflow muffler.
andrew44 is offline   Reply With Quote Quick reply to this message
Unread 07-07-2012, 12:54 PM   #52
Shafer57
Registered User
2006 WK 
 
Join Date: Sep 2011
Location: delran, nj
Posts: 679
Can I get 2 links if you guys know. Thanks

1. EGR replacement on hemi beginning to end.
2. Catch can install on hemi beginning to end.
__________________
Dodge Dakota R/T 360ci Small-block _sold_
Jeep GC 5.7L Hemi- Magnaflow Cat-Back, BT Catch Can, 20" Gloss black SRT Reps
275/45R20 Nexen Roadian, Blacked out, 180 Stat _SOLD_
2008 335i Twin-Turbo
Shafer57 is offline   Reply With Quote Quick reply to this message
Unread 07-07-2012, 08:31 PM   #53
Walt
Registered User
2008 WK 
 
Join Date: Oct 2009
Location: Midland, MI
Posts: 1,530
I've noticed 2 loose correlations about mpg's and MDS operation. These are not rigorous, but more experience- and feeling-based:
1. As the oil approaches its 5K miles change interval, MDS seems to be more sensitive to engagement. Probably due to somewhat increased viscosity.
2. As the spark plugs approach their 30K miles change interval, MDS gets more sensitive. Probably related to increased gaps as the electrodes wear.

Right now, I'm 1,500 miles from an oil change and spark plugs.

5.7L HEMI's seem very sensitive to throttle, so the more MDS you can get, the better the overall mpg's. I also noticed that spark advance and mpg's dropped dramatically this week due to very hot weather (90+ degrees) and that I inadvertently filled up with 87 octane instead of 89. Seems to be returning to normal after I filled up today with 89 octane fuel.

Anyone else see these relationships?
__________________
HEMI CLUB MEMBER #45; SILVER WK CLUB MEMBER #13
'08 WK GC Limited. 5.7L HEMI. Quadra-Trac II. Bright Silver Metallic. Class IV hitch.
Michelin LTX M/S tires. Fumoto oil drain valve. Billet Technology oil catch can.
Walt is offline   Reply With Quote Quick reply to this message
Unread 07-11-2012, 02:43 PM   #54
fingaz
Registered User
2009 WK 
 
Join Date: May 2012
Location: Morristown, NJ
Posts: 235
So I just have to brag.... hit 27.3 mpg for a bit while driving down to Maryland last week! We were driving on 113 in Delaware. Flat road, no traffic and I was going slower and trying keep the rpm's as low as possible.

Normally, I get around 21 on the highway and it can go all the way down to 14 when I'm dealing with the horrible NJ traffic and driving with a lead foot.
jeep-mpg.jpg  
__________________
2009 3.7L Laredo Black | Two-Toned Leather | RER Nav/DVD/BA System | Viper alarm | HID's in the lows and fogs | Westin Brush Guard | Tinted Tails | Custom Blue LED Interior/Rear Hatch Lights | Rough Country 1.5" Spacers | General Grabber 255/70r17 -- Island Beach State Park 4x4 Mobile Sportsfishing Permit In -- To Do: Install Uniden CB, Rock lights
fingaz is offline   Reply With Quote Quick reply to this message
Unread 07-12-2012, 12:48 AM   #55
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by fingaz
So I just have to brag.... hit 27.3 mpg for a bit while driving down to Maryland last week! We were driving on 113 in Delaware. Flat road, no traffic and I was going slower and trying keep the rpm's as low as possible.

Normally, I get around 21 on the highway and it can go all the way down to 14 when I'm dealing with the horrible NJ traffic and driving with a lead foot.
I've tried numerous times to upload my 29.0 MPG but the app crashes on my phone every time
tmidz87 is offline   Reply With Quote Quick reply to this message
Unread 07-12-2012, 12:49 AM   #56
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by tmidz87

I've tried numerous times to upload my 29.0 MPG but the app crashes on my phone every time
I take that back lol

forumrunner_20120712_014908.jpg
tmidz87 is offline   Reply With Quote Quick reply to this message
Unread 07-12-2012, 07:39 AM   #57
DWade75
Registered User
2006 WK 
 
Join Date: Apr 2012
Location: Fort Lauderdale, Florida
Posts: 2
I have the 4.7 and get about 14 in the city. Which chip do people recommend for the best MPG improvement?
DWade75 is offline   Reply With Quote Quick reply to this message
Unread 07-12-2012, 08:11 PM   #58
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by DWade75
I have the 4.7 and get about 14 in the city. Which chip do people recommend for the best MPG improvement?
I prefer Diablo but others prefer superchip
tmidz87 is offline   Reply With Quote Quick reply to this message
Unread 07-12-2012, 08:37 PM   #59
Shafer57
Registered User
2006 WK 
 
Join Date: Sep 2011
Location: delran, nj
Posts: 679
Unfortunately let's just face it. We're trying to move 5000 lb. bricks
Nothing that i'm not used to when it comes to gas mileage, but i do know w/ some minor tweaks most of us could squeeze a little extra MPG out of the truck.

I've found that neither major name tuners (Diablo, Superchip) have done anything for me on any vehicle i've owned on MPG. But definitely more bang for my buck on performance which is a plus.
__________________
Dodge Dakota R/T 360ci Small-block _sold_
Jeep GC 5.7L Hemi- Magnaflow Cat-Back, BT Catch Can, 20" Gloss black SRT Reps
275/45R20 Nexen Roadian, Blacked out, 180 Stat _SOLD_
2008 335i Twin-Turbo
Shafer57 is offline   Reply With Quote Quick reply to this message
Unread 07-13-2012, 12:57 AM   #60
tmidz87
Registered User
2006 WK 
 
Join Date: May 2012
Location: Halifax, Pennsylvania
Posts: 102
Quote:
Originally Posted by Shafer57
Unfortunately let's just face it. We're trying to move 5000 lb. bricks
Nothing that i'm not used to when it comes to gas mileage, but i do know w/ some minor tweaks most of us could squeeze a little extra MPG out of the truck.

I've found that neither major name tuners (Diablo, Superchip) have done anything for me on any vehicle i've owned on MPG. But definitely more bang for my buck on performance which is a plus.
The new update for Diablo has a MPG booster and it works well I posted a pick of my avg a few posts up
tmidz87 is offline   Reply With Quote Quick reply to this message
Reply

Tags
hemi , mpg

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.