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Unread 02-05-2013, 06:05 PM   #16
braddf
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2001 WJ 
 
Join Date: Aug 2012
Location: clinton, NC
Posts: 734
But i was averaging 18-20 mpg for the longest time when i first got it!

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Unread 02-05-2013, 06:08 PM   #17
WJlover
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1999 WJ 
 
Join Date: Apr 2012
Location: portsmouth, nh
Posts: 657
change your fuel filter, air filter, spark plugs, clean throttle body, use proper air pressure in tires, do a fuel system service at a shop, and remember that bigger tires, lifts and other mods of that nature will bring down your mpg.

unfortunately though, as cars age, their fuel mileage goes down.
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Unread 02-05-2013, 06:45 PM   #18
LWelch
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1999 XJ Cherokee 
 
Join Date: Jan 2012
Location: Stockbridge, GA
Posts: 18
99 4.0 -- getting 19.1 mpg

I bought this Jeep GC 2 WD 4.0 not running, built the engine stock, now got about 15,000 miles on engine, jeep has about 200K total. last 2,000 miles w/half interstate at 70 mph cruise/control, rest 5 - 10 miles suburban driving.. I don't think that's bad!! I've learned to coast a lot more, - I don't mean holding up traffic, just drive half block ahead, take foot off when you don't need power. Another thing, I'm using 5-30 oil, I believe that makes a difference. Full hot engine still has just under 50psi at idle. Runs like a dream!! ((My forum registry says XJ, but I thought it was a WJ??
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Unread 02-05-2013, 06:50 PM   #19
ZeJokee
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Quote:
Originally Posted by LWelch View Post
I bought this Jeep GC 2 WD 4.0 not running, built the engine stock, now got about 15,000 miles on engine, jeep has about 200K total. last 2,000 miles w/half interstate at 70 mph cruise/control, rest 5 - 10 miles suburban driving.. I don't think that's bad!! I've learned to coast a lot more, - I don't mean holding up traffic, just drive half block ahead, take foot off when you don't need power. Another thing, I'm using 5-30 oil, I believe that makes a difference. Full hot engine still has just under 50psi at idle. Runs like a dream!! ((My forum registry says XJ, but I thought it was a WJ??
Key word is 2wd.
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93 ZJ Ltd, Blacked out, 5.2L, Reman 46RH, Reman 242 Swap, 3.5'' IRO + 2" BB, 33x12.50r15 Mud Claw MTX radials, Bushwacker Flares, 216,XXX miles (Still parked in NC)
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Unread 02-05-2013, 06:54 PM   #20
SKI_VT
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2000 WJ 
 
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Quote:
Originally Posted by ZeJokee

Key word is 2wd.
4wd is 2wd unless slip is detected in the front.
The difference it makes under the normal conditions is a spit in the ocean.

4wd is not AWD
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Unread 02-05-2013, 07:12 PM   #21
ZeJokee
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He stated 2wd. A 4wd WJ still has the front diff and driveshaft spinning which causes drag therefore lower MPG. A 2wd does not have but the rear end. Thats why the 242 t-case gets no better than the 247.
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99 WJ Ltd, Blacked out, 4.7L, 242j Swap, 2'' BB, 245/75/16 Kuhmo Venture AT KL78, Flow Master Super 40, MagnaFlow high flow Cat, Akebono caliper upgrade, Addco rear swaybar, Westin brush guard, Moog Super Trail Boss, Rancho RS5000, Rola roof rack with dual kayak J hooks, PAC-AOEM-CHR, Sony Xplod 1200w amp, 2 Sony Xplod 12'' subs, 118,XXX miles (SOLD)
93 ZJ Ltd, Blacked out, 5.2L, Reman 46RH, Reman 242 Swap, 3.5'' IRO + 2" BB, 33x12.50r15 Mud Claw MTX radials, Bushwacker Flares, 216,XXX miles (Still parked in NC)
04 F-350 SD Crew Cab FX4 Lariat, 6.0 PSD SRW, Head studs, AFE Stage 2 SI Pro Guard 7 intake, Blue Spring mod, 150,XXX Miles

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Unread 02-06-2013, 12:51 AM   #22
cmp77
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2003 WJ 
 
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My I6 gets as of right now 13.3 average and my v8 as of right now reads 12.2 yours sounds good to me
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Unread 02-06-2013, 01:07 AM   #23
bigchevy87
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1998 TJ Wrangler 
 
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im getting 12.5 in a AWD 4.7L, your doing good but you almost have 100,000miles on it so do a service like alot of people are saying to do
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Unread 02-06-2013, 01:28 AM   #24
JeepFireman304
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2004 WJ 
 
Join Date: Feb 2013
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My 4.0 gets 16 to 18 if I'm nice to it. I started getting 14 and replaced a O2 sensor and back to my normal range.
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Unread 02-06-2013, 02:35 PM   #25
dsodko
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2002 WJ 
 
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Wj

I miss my '99 Grand. 6 cycl, Michelens, Syn oil & tuned up. I was getting 19mpg w/lead foot. Our '02 WJ get 15mpg w/4.7 V8.

IT IS A JEEP THING !
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Unread 02-06-2013, 04:56 PM   #26
mycreativename
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Hahaha I would kill for 14+ MPG.
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Unread 02-06-2013, 06:35 PM   #27
homerdog
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I have an 02 4.0 I6 with a 2" BB 245/75-16. I did a Superchip economy tune and get 20+ highway @ 70mph. In city gets 17-18. I do coast to stops as much as possible.
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Unread 02-06-2013, 06:50 PM   #28
lazyWJ
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I can squeak 17mpg or so from my 02 4.7HO on the highway, but it's been cold here and I haven't run it in warm weather yet. On a related note, has anyone noted how the EVIC numbers compare to calculated numbers?
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Unread 02-06-2013, 08:14 PM   #29
mycreativename
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Quote:
Originally Posted by lazyWJ View Post
I can squeak 17mpg or so from my 02 4.7HO on the highway, but it's been cold here and I haven't run it in warm weather yet. On a related note, has anyone noted how the EVIC numbers compare to calculated numbers?
Its generally accepted that the EVIC is off more often than not in our WJ's. Mine is always quite optimistic since my fuel filter change.

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"With enough fabbing, time & $, it's certainly possible.
That being said, it's like boinkin' your sister...just because you can, doesn't mean you should." - Double E
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