Improving MPG on my Jeep Grand Cherokee - Page 4 -
LinkBack Thread Tools
post #46 of 55 Old 05-22-2012, 06:50 PM
Registered User
2003 WK 
Join Date: May 2012
Location: Hershey
Posts: 2
Okay then do drive through floods...thats why we have Jeeps! haha


Translation: Whatever is received is received according to the manner of the receiver.

Spiritsuit7 is offline  
Sponsored Links
post #47 of 55 Old 11-24-2013, 10:02 PM
Registered User
Join Date: Nov 2013
Posts: 1
Worst Jeep Mileage Ever?

Great site! I just bought a 1999 Jeep Grand Cherokee Laredo V8 with 145K miles on it. Had a tune-up last week. According to the console, I'm getting a measly 6.7 mpg in the city. I was expecting to get at least 12 to 14 mpg. Any ideas why it's so much lower than its e.p.a, and what I can do about it? I'm going to try Sea Foam next week, but I'm not very optimistic about it getting my mileage up to the rated levels. It's driving me nuts!
Duly_Noted is offline  
post #48 of 55 Old 11-27-2013, 01:08 PM
Registered User
1998 ZJ 
Join Date: Apr 2009
Location: Virginia
Posts: 704
Reduce rolling friction using skinny tires.
Reduce the wheel rotating mass by using light weight rims.

Put in a 4 cylinder engine.
sdowney717 is offline  
post #49 of 55 Old 11-27-2013, 01:19 PM
Registered User
1998 ZJ 
Join Date: Apr 2009
Location: Virginia
Posts: 704
56 to 60 mpg improvement by putting on donuts just on the rear of car.

sdowney717 is offline  
post #50 of 55 Old 11-28-2013, 10:46 AM
Registered User
2001 WJ 
Join Date: May 2013
Location: Virginia beach
Posts: 72
I feel really bad for you guys I look at double digits all day on highway around 27-32. But not so much in the city I go through gas really fast I have one hell of a lead foot.. spectra air filter autolite plugs. Oil change with treatment. And then once a year I do a seafoam cleaning in the brake booster vacuum hose... that's all I did. And mine is an inline 6 jeep wj so it may be a bit different in weight

Zombieslammed is offline  
post #51 of 55 Old 02-26-2014, 05:22 PM
Registered User
Join Date: Feb 2014
Location: sauk city
Posts: 2
As with any motor it's just a big air pump the more air you can get in and out the better of you'll be.
nurpelflup is offline  
post #52 of 55 Old 04-01-2014, 03:52 AM
Registered User
1998 ZJ 
Join Date: Apr 2009
Location: Virginia
Posts: 704
Motor is a big air pump, BUT more air in and out = more gasoline used.
That is due to the engine computer maintains the proper gas fuel to air ratio at 14 air to 1 gas.

Heavy foot open up the throttle means your pumping more air, more air in, more power, more gas used.

A restricted air filter means less air flow = less gasoline flow since computer controls fuel injection = better gas mileage but less power.

The oxygen sensor tells computer how to maintain proper stoichiometric ratio, and then it does.
sdowney717 is offline  
post #53 of 55 Old 11-24-2015, 07:43 AM
Registered User
Join Date: May 2015
Location: north wales
Posts: 8
Switch to manual seats, chuck the spare tire, remove the back seats, slide the roof racks all the way to the back and then pull the front driveshaft during the summer. Add a wash and wax and you'll get low/mid 20s.
callmebignate is offline  
post #54 of 55 Old 11-24-2015, 07:59 AM
Registered User
Join Date: May 2015
Location: north wales
Posts: 8
You can also take plastic and streamline the undercarriage. Door trim strips on every edge to reduce drag, too.
callmebignate is offline  
post #55 of 55 Old 12-07-2015, 08:30 AM
Registered User
2000 TJ Wrangler 
Join Date: Mar 2011
Location: Johnson City
Posts: 847
Zombie thread! Just won't die!

2000 TJ Sahara 4.0
1961 Willys CJ5
2004 WJ Grand Cherokee Laredo, Freedom Edition
OsteKuste is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Will A 242 Transfer Case From A 90 Cherokee Fit In My 99 Jeep Grand Cherokee.?? squirrly ZJ Grand Cherokee Forum 8 03-05-2009 05:55 PM
Jeep Liberty 8.25 Axle into a Jeep Grand cherokee??? blackjeeprubi ZJ Grand Cherokee Forum 23 10-13-2008 07:10 AM
jeep grand cherokee 00 peepmyjeep00 ZJ Grand Cherokee Forum 2 01-14-2008 04:54 AM
Need Help with my 05 Jeep Grand Cherokee dallag WK Grand Cherokee & XK Commander Forum 2 07-25-2007 04:36 AM
Jeep Grand Cherokee HelpMeFindaGC ZJ Grand Cherokee Forum 15 02-09-2006 06:03 PM

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome