MPG on cruise control? - 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 > ZJ Grand Cherokee Forum > MPG on cruise control?

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineThe Solution to Radius Arm Bind - Meet Lock-N-LoadFS: Jeep Fog Light LED Bulbs! Several Brightness Options!

Reply
Unread 03-04-2012, 07:57 AM   #1
Camaro16
Member
1998 ZJ 
 
Join Date: Dec 2011
Location: Belfast, UK
Posts: 328
MPG on cruise control?

Does anyone else get significantly better mileage using cruise control? Normally, if I take it as easily as possible, I'll get around 340 miles on a full tank.
Now I know the DTE computer isn't going to be totally accurate, but I filled the tank yesterday and then did 150 miles, at about 60mph, all on cruise. And my DTE readout is still 276 miles! The fuel gauge seems to back that up, as well.
Anyone else notice big differences between grannying it without cruise, and doing the same mileage at the same speed with cruise turned on? It's a fairly big deal - at the minute (I'm in the UK) it costs me $200 to fill up from empty!

Oh - 1998 4.0 engined Orvis with the tow package, presume the gearing affects things.

Camaro16 is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 08:13 AM   #2
AcidAnton
Czech OffRoader
 
AcidAnton's Avatar
2005 WK 
 
Join Date: Apr 2011
Location: Calgary, AB
Posts: 124
Of course cruise control is the best way to keep and maintain a consistent momentum and you are not always hitting the gas peddle when you loose speed and try to maintain the speed limit..

I always use cruise, I found I save way more gas
__________________
2005 WK 5.7L HEMI Limited - Silver
Mods:
Superchips 3870 Flashpaq (Set @ 91 Preformance), BT Catch Can, Taylor Shorties, Daystar 2" BB, Spidertrax 1.5" spacers


Upcoming Projects: Digital Camo Paint Job mod , 4" Superlift, 33" Tires, ARB Bumber, Tire Mount on Hitch

Silver WK Club Member #88
HEMI Club Member #80

R.I.P
1998 ZJ 5.9L Limited - Platinum
1997 ZJ 5.2L V8 - Mud Flooded the Engine - Donor Jeep now

Quote:
Originally Posted by McCloudsZJ View Post
I named mine Jezebel because she used to be the most powerful thing in the world, but now shes just an old, dirty ***** whose been around the block a few times.
AcidAnton is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 08:47 AM   #3
gactech
Registered User
1998 ZJ 
 
Join Date: Sep 2011
Location: San Marcos, Ca
Posts: 297
Yup. The cc makes itty bitty adjustments to the throttle to maintain speed. Your for doesn't
gactech is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 08:50 AM   #4
burtha95xj
Registered User
2002 WJ 
 
Join Date: Aug 2011
Location: menasha, wisconsin
Posts: 220
In my xj i get worst highway mpg, period
__________________
[IMG]http://i183.photobucket.com/albums/x249/estonph95/2012-01-18_14-19-45_952.jpg[/IMG]
2012 Response vehicle
burtha95xj is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 09:02 AM   #5
Foundrydude
Registered User
1995 ZJ 
 
Join Date: Jan 2011
Location: Flatsville, IA
Posts: 2,692
Some other OBDII vehicles of this era actually use more efficient fuel and spark curves when the cruise is engaged. Not sure aboutr ZJ.
Foundrydude is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 09:42 AM   #6
Camaro16
Member
1998 ZJ 
 
Join Date: Dec 2011
Location: Belfast, UK
Posts: 328
Quote:
Originally Posted by gactech View Post
Yup. The cc makes itty bitty adjustments to the throttle to maintain speed. Your for doesn't
My foot tries to!
Camaro16 is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 10:07 AM   #7
Mike97ZJ
Registered User
1997 ZJ 
 
Join Date: Oct 2009
Location: Newport, RI
Posts: 1,228
Yup, same thing with every other car I've owned that had CC. Although with my ZJ when I'm hitting larger hills I use the gas pedal, so I can gain some speed before I hit the hill. Otherwise the CC always kicks the tranny down a gear or two, since the 4.0 doesn't have the guts to make the grade in OD. If I get a "running start" at the hill I can make it up in OD if it's not too long.
Mike97ZJ is offline   Reply With Quote Quick reply to this message
Unread 03-04-2012, 12:51 PM   #8
cdaniels85
Registered User
1995 ZJ 
 
Join Date: Apr 2011
Location: Greensburg, PA
Posts: 117
Quote:
Originally Posted by Mike97ZJ
Yup, same thing with every other car I've owned that had CC. Although with my ZJ when I'm hitting larger hills I use the gas pedal, so I can gain some speed before I hit the hill. Otherwise the CC always kicks the tranny down a gear or two, since the 4.0 doesn't have the guts to make the grade in OD. If I get a "running start" at the hill I can make it up in OD if it's not too long.
x2 on that. I've gotten it down to a science.
cdaniels85 is offline   Reply With Quote Quick reply to this message
Unread 02-05-2013, 04:30 PM   #9
mickeyd411
Registered User
 
Join Date: Jan 2013
Posts: 11
Quote:
Originally Posted by Mike97ZJ View Post
Yup, same thing with every other car I've owned that had CC. Although with my ZJ when I'm hitting larger hills I use the gas pedal, so I can gain some speed before I hit the hill. Otherwise the CC always kicks the tranny down a gear or two, since the 4.0 doesn't have the guts to make the grade in OD. If I get a "running start" at the hill I can make it up in OD if it's not too long.
I am seriously considering an attempt to limit how much throttle the cruise can add. This thing opens up going up a hill and that can't be good for mpg!
mickeyd411 is offline   Reply With Quote Quick reply to this message
Unread 02-05-2013, 05:25 PM   #10
isenior
Registered User
1997 ZJ 
 
Join Date: Apr 2011
Location: London, UK
Posts: 61
In the UK too. Converted to LPG. I work it out by pence per mile cost between fills to max. Yesterday running up the M1 filled up at London gateway services then again at junction 24 having gone the whole way on cruise at a steady 70. Cost me slightly less than 20p per mile which is awesome. Driving it the whole way without cruise I reckon the best I could get is probably about 23. So that would make a 15% improvement on a long steady run.
__________________
ZJ97purpleUK
isenior is offline   Reply With Quote Quick reply to this message
Reply

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.