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06-09-2008, 10:04 AM
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#1
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Registered User
Join Date: Nov 2002
Location: north mississippi
Posts: 781
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Decent Fuel Mileage Is Possible on a 5.9 Limited
I have just completed a 5 tank combined average on my '98 5.9 ZJ and here's what I came up with:
1. 17.6mpg
2. 17.2mpg
3. 19.1mpg
4. 18.4mpg
5. 18.1mpg
Total avg.: 18.08mpg
Keep in mind, the 1st two tanks were combined with a good amount of city traffic driving, and the high was doing about 90% highway at 65mph with just minimal city driving. I have noticed this large engine does not like stop and go traffic. I know every non-hybrid gets worse fuel mileage in town, but its amazing the disparity in city vs. highway driving this gets!!!!!! Best I can come up with for my particular Jeep, is 12-13mpg city, and 20-21mpg highway (when speeds are kept at 70mph or lower).
__________________
New Toy: 2005 Rubihara #111 of 1000
Wife's: 2005 Liberty CRD
2.5"lift, Rock Lizard rock rails, Front True Trac, Rear Powertrax N0-Slip locker, & 31" Duratracs on 15x7 rock crawler rims
Tow Rig: 2003 Silver Reg. Cab Dodge 2500 2wd
5.9 Cummins (lots of mods) dyno proven 550+rwhp
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06-09-2008, 10:08 AM
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#2
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Registered User
Join Date: Sep 2007
Location: Louisburg, NC/Camp Pendleton, CA
Posts: 1,661
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Sounds about right for a 5.9...You got me beat. Im gettin 14~15 Highway with the 4.0 and keepin it around 60.
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Dylan-19 and Yearning
93 Rubigrand - Sold... :'(
95 Grand Cherokee Limited - 5.2 Mall Crawler
55 Willy's M38a1 - 231v6, 33" Super Swampers, D44 Full Floater Rear, Locked Front and Rear, 5.38 Gears, Viair OBA, Bilsteen 5100 shocks, Dana 18, Turbo 350, S10 Power Steering, Tilt-wheel, Full Cage, Flat Fenders....
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06-09-2008, 10:26 AM
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#3
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Registered User
Join Date: Feb 2004
Location: Staten Island, NY
Posts: 1,488
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Better mileage than my 5.2 
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06-09-2008, 12:48 PM
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#4
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Registered User
Join Date: Dec 2001
Location: Denver, Colorado
Posts: 2,049
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That's about right for a stock 5.9. Best I ever got was driving through Wash. St. 10 years ago this week. 22mpg.
Best I get now is 16.
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ZJ 98 5.9 LTD. Lots of mods. 7" T&T's Long Arm Lift ,BFG KM2"s,35X12.50x16's,4:56's, Vanco brake upgrade, M1intake,Holley52mmTB,MikeLeach Headers,, Arb'ed HP D30,Aussie Locked rear,Procomp MX6 Shocks,Arb front,RearTR bumpers,ECT.ECT.
Latest Pics
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06-09-2008, 12:58 PM
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#5
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Registered User
Join Date: Aug 2007
Location: Alaska
Posts: 363
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See my Avatar. 
The best thing that you can do to get good mileage is keep your Jeep tuned up, make sure your tires are inflated properly, remove anything that creates unneeded drag (roof racks, light bars, etc), and be easy on your skinny pedal.
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1997 ZJ Laredo. 4.0 I6, 242 TC.
Quote:
Originally Posted by millhousenator
Jeeps are like boobs, some are big, some are small, some look fake and some look real, but they are still boobs so get the **** over it!
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nightcrew #0040
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06-09-2008, 02:13 PM
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#6
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zj tractor
Join Date: Jun 2007
Location: southern afganistan
Posts: 5,224
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thats good, once my motor wears in, thats what i expect to get.
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hard working private first class in the United States Marine Corps.
Quote:
Originally Posted by shift_grind
It's threads like this that make me wonder why people lift there jeeps
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its comments like this that make me wonder why some people are jerks.
build thread: http://www.jeepforum.com/forum/f197/...ndard-1056365/
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08-05-2008, 01:01 PM
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#7
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Registered User
Join Date: Nov 2002
Location: north mississippi
Posts: 781
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***Update***
Since I 1st posted this thread, I since added my lift w/tires, and have quiet a few more mileage reports to compare.
1. 17.6mpg
2. 17.2mpg
3. 19.1mpg
4. 18.4mpg
5. 18.1mpg
6. 17.7mpg
7. 17.8mpg
8. 18.3mpg
Total avg.: 18.05mpg (before lift/tires)
9. 17.8mpg
10. 16.7mpg
11. 17.4mpg
12. 17.6mpg
13. 17.2mpg
14. 17.5mpg
15. 17.6mpg
16. 17.7mpg
17. 17.0mpg
18. 18.1mpg
19. 19.4mpg
Total avg.: 17.64mpg (after lift/tires)
All this was hand calc. mileage, Over the course of approx 6,000mi. So, as you can see, I lost a consistant .5mpg once the larger tires and lift were installed. Still completely pleased with the ZJ so far to date!!!
__________________
New Toy: 2005 Rubihara #111 of 1000
Wife's: 2005 Liberty CRD
2.5"lift, Rock Lizard rock rails, Front True Trac, Rear Powertrax N0-Slip locker, & 31" Duratracs on 15x7 rock crawler rims
Tow Rig: 2003 Silver Reg. Cab Dodge 2500 2wd
5.9 Cummins (lots of mods) dyno proven 550+rwhp
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08-05-2008, 01:09 PM
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#8
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Registered User
Join Date: Jun 2008
Location: belvidere, Illinois
Posts: 771
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sweet deal, yeah thats what a 5.9 would be with highway mileage, they do better cause of the electric cooling fan,
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-Black Limited 1998 Jeep ZJ 5.2 nv3550 np242, 35s, lots of other stuff
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08-05-2008, 01:19 PM
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#9
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Registered User
Join Date: Nov 2002
Location: north mississippi
Posts: 781
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Most of my driving, except the 19mpg+ readings were done in about 70/30 highway/city type traffic. When I got readings of 19+, both were 95% highway cruising at 65-70mph.
__________________
New Toy: 2005 Rubihara #111 of 1000
Wife's: 2005 Liberty CRD
2.5"lift, Rock Lizard rock rails, Front True Trac, Rear Powertrax N0-Slip locker, & 31" Duratracs on 15x7 rock crawler rims
Tow Rig: 2003 Silver Reg. Cab Dodge 2500 2wd
5.9 Cummins (lots of mods) dyno proven 550+rwhp
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08-05-2008, 03:19 PM
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#10
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Registered User
Join Date: Jul 2006
Location: North Texas
Posts: 1,057
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Quote:
Originally Posted by Darthteddy
Sounds about right for a 5.9...You got me beat. Im gettin 14~15 Highway with the 4.0 and keepin it around 60.
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Don't know what transmission you have, but that sounds about like what I got in a WJ whose lock-up converter wasn't locking-up.
Might be something for you to check.
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Decent Fuel Mileage Is Possible on a 5.9 Limited
