Cj-7 mpg - 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 CJ Forum > Cj-7 mpg

ROCK BOTTOM prices on LIFT KITS at Rockridge4wd!! WANT TO Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineSavvy Billet LED Tail Lights

Reply
Unread 11-24-2014, 02:19 AM   #1
uh60baldwin
Registered User
 
Join Date: Oct 2014
Posts: 5
Cj-7 mpg

I have a 1984 CJ-7 with the 258 and 5 speed
I live in fairbanks Ak and just moved across town and I am just burning gas like its going out of style just seeing what you guys are getting .
And any ideas to maybe pick up a few more

Ps I am getting 11.5 city 12.5 highway

uh60baldwin is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 02:41 AM   #2
Unretarded
Senior Member
 
Unretarded's Avatar
1963 CJ5 
 
Join Date: May 2014
Location: Ventura, Ca
Posts: 523
What size tires........if they are big ones, try not using 5th gear.
__________________
Jeep...the first vehicle on the moon.....next trip we are bringing the tub!

It is gunna cost more and take longer than you thought...plan ahead!
Unretarded is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 03:28 AM   #3
VooDoo2
Registered User
1978 CJ7 
 
Join Date: Jun 2010
Location: Brisbane, Australia
Posts: 691
Fuel usage is the admission price for awesome. When it runs low, refill. These things drink a lot, drip, break, rattle and wonder. Thats why we love em.
VooDoo2 is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 03:46 AM   #4
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,961
That is low for sure. If you can find ethanol free gas, you will boost the mileage considerably. Also don't lug the engine, they get the best gas mileage running around 2300 rpm. I get about 5 mpg better by forgetting I have a 5th gear. At 65 mph mine turns about 2300 in 4th with my 33's and 3.31 gears.
I also got a nice boost in power and mileage by disabling the ECU and manually tuning it for the emissions sniffer. We don't have a visual, just a tailpipe test. If it doesn't pollute, you are good to go.
Make sure your air filter is clean. That is a sneaky gas mileage killer.
__________________
Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 05:33 AM   #5
stgil
Registered User
1982 CJ7 
 
Join Date: Apr 2010
Location: FRANCE
Posts: 448
Full stock '82 CJ7 OEM Diesel DANA 300,T5, ratio 4.56,stock wheels: between 30-37 mpg... (37 is my personal record)

Regards,

Gilles
__________________
FULL DANA 30 REBUILD->http://www.jeepforum.com/forum/f8/cj7-dana-30-full-rebuilt-setup-part-i-1121189
'82 CJ7 LAREDO REBUILD->http://www.jeepforum.com/forum/f8/82-cj7-laredo-diesel-restoration-1179198/
stgil is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 08:35 AM   #6
j33pman
Registered User
1984 CJ7 
 
Join Date: Jun 2007
Location: Cobleskill, NY
Posts: 962
I get about 15 the last time I checked.

258, Weber Carb, no ECU. T-5 trans. 4.56 gears, lockers, and 33" Super Swamper LTB's

I can't complain
__________________
Bill H. - 1984 CJ-7
Now with Fiberglass!
My Rebuild thread
http://www.schohariecountyjeepclub.org
j33pman is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 01:46 PM   #7
uh60baldwin
Registered User
 
Join Date: Oct 2014
Posts: 5
Dang my tires are only 30x9.5 r15 but I am going to try the not using 5 gear I have been using 87 should I try 91
uh60baldwin is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 02:01 PM   #8
Mike Romain
Registered User
1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,961
Quote:
Originally Posted by uh60baldwin View Post
Dang my tires are only 30x9.5 r15 but I am going to try the not using 5 gear I have been using 87 should I try 91
When I used 91 in my 258, it had no ethanol in it. That boosted me up to 22-23 mpg highway and there was noticeable pedal power increase.
__________________
Mike
86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 02:03 PM   #9
thantos858
Web Wheeler
1974 CJ5 
 
Join Date: Jan 2005
Location: Santa Maria
Posts: 1,578
Quote:
Originally Posted by uh60baldwin View Post
Dang my tires are only 30x9.5 r15 but I am going to try the not using 5 gear I have been using 87 should I try 91
No need to change the octane level of the fuel. A stock Jeep motor wont need more than 85/87 octane to run properly. If you haven't done a tune up in awhile do one. I would also adjust the carb properly to eliminate that possibility.
thantos858 is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 02:05 PM   #10
thantos858
Web Wheeler
1974 CJ5 
 
Join Date: Jan 2005
Location: Santa Maria
Posts: 1,578
Quote:
Originally Posted by stgil View Post
Full stock '82 CJ7 OEM Diesel DANA 300,T5, ratio 4.56,stock wheels: between 30-37 mpg... (37 is my personal record)

Regards,

Gilles
Sadly the US government doesn't like diesel motors. I would love a stock diesel motor for a Jeep.
thantos858 is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 03:21 PM   #11
uh60baldwin
Registered User
 
Join Date: Oct 2014
Posts: 5
I have been looking at doing this do you guys think It would help http://www.quadratec.com/products/55102_60X_PG.htm
And maybe a new carb thinking going with weber
uh60baldwin is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 03:34 PM   #12
JeepHammer
Running On Empty...
1973 CJ5 
 
Join Date: Aug 2007
Location: South West Indiana
Posts: 10,702
Quote:
Originally Posted by uh60baldwin View Post
I have a 1984 CJ-7 with the 258 and 5 speed
I live in fairbanks Ak and just moved across town and I am just burning gas like its going out of style just seeing what you guys are getting .
And any ideas to maybe pick up a few more

Ps I am getting 11.5 city 12.5 highway
Quote:
Originally Posted by uh60baldwin View Post
Dang my tires are only 30x9.5 r15 but I am going to try the not using 5 gear I have been using 87 should I try 91
Quote:
Originally Posted by uh60baldwin View Post
I have been looking at doing this do you guys think It would help http://www.quadratec.com/products/55102_60X_PG.htm
And maybe a new carb thinking going with weber
Throwing random parts at it usually solves nothing.

You need to figure out what is happening, Vacuum leaks, gear ratio, when the last tune up was, altitude, ect.
JeepHammer is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 07:18 PM   #13
mb_24
Registered User
1985 CJ7 
 
Join Date: Nov 2013
Location: Flemington, NJ
Posts: 115
I was getting 18-21 depending on how much highway I did. That's with 29" tires. 5 speed. And the AC running full blast...oh wait, that's just the breeze. Ain't got no doors or top.

1985 CJ-7 Renegade, Sebring Red, 258 + 5-speed
mb_24 is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 09:23 PM   #14
Baconj81
Registered User
1983 CJ5 
 
Join Date: May 2014
Location: Larue, Tx
Posts: 122
Was getting 13.5 in my CJ5. Then nuttered and team rushed and it dropped to 11.5. WTF?! Haven't figured out what's going on yet!
Baconj81 is offline   Reply With Quote Quick reply to this message
Unread 11-24-2014, 11:01 PM   #15
BagusJeep
Web Wheeler
 
BagusJeep's Avatar
1981 CJ7 
 
Join Date: Jul 2009
Location: Bali, Indonesia
Posts: 4,685
Bacon, you have only part sorted the ignition. When you took out the computer did you change the mechanical advance head in the distributor? If not you may have 6.75 degrees of mechanical advance, not 13 degrees which would make it run better (i.e. you are developing maximum moment on the crank 6 degrees late, which means you are not translating into maximum torque as it is already heading down and around). With the Nutter you take out the advance the computer used to put in, if it worked.
__________________
BagusJeep lives in Bali, the Land of Temples.
With a Jeep every prayer counts.

1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1995 Cherokee 4.0 - CHEROKEE
BagusJeep 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






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.