Jeep 2k wrangler bad fuel economy

Jeep 2k wrangler bad fuel economy

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pete

Hinsdale, IL

#1 Nov 1, 2006
Hello ALL,
We just purchased our 2000 jeep wrangler 4.0 automatic with 64,000 miles, I had it checked out by jeep dealer & they said the jeep was in excellent condition.

My current problem is that I am only getting about 10MPG fuel economy. I was wondering if anyone had similar issue & what was the fix.

Couple of friends suggested that their 91 jeep had bad catayltic converter.
gag

Castine, ME

#2 Nov 5, 2006
wifes new 2007 wrangler sahara unlimited with 2200 miles getting 20+ mpg..good surprise...but...having electrical problems .door locks acting up..drivers door doesnt always work. also radio kicks off for a second when power windows operated and finally all dash lites came on at 60 mph with cruise on and engine lost power..pulled over in traffic and all went normal? back to dealer monday. overall its pretty neat in a kinda soccer mom beastly kinda way! it will take a thrashing..oops.
TIM

Stockton, CA

#3 Dec 19, 2006
pete wrote:
Hello ALL,
We just purchased our 2000 jeep wrangler 4.0 automatic with 64,000 miles, I had it checked out by jeep dealer & they said the jeep was in excellent condition.
My current problem is that I am only getting about 10MPG fuel economy. I was wondering if anyone had similar issue & what was the fix.
Couple of friends suggested that their 91 jeep had bad catayltic converter.
I have the same year and it only gets 10 mpg have you found out whats causing this???
Todd

Northome, MN

#4 Dec 22, 2006
I drove my '99 Wrangler Sahara 4.0 automatic for six years, and that's what it got the whole time. It's a Jeep thing, I guess.
TIM

United States

#5 Dec 23, 2006
2000 Wrangler 4inch lift with 33s, 5 speed 4.0 with Jet preformance module and K+N cold air intake with 67,000 miles geting 9-10mpg wih cheep gas and 12mpg with 91 octain. This Jeep was bought this way so I have no idea what kind of gas mileage it was getting stock. I was thinking if I put 4.88s or 4.56s in the diffs this would improve gas mileage? 4th and 5th gears seem to be under powered. I have to push the pedal half way down or to the floor to maintain free way speeds (70-80) if ther is any kind of incline on the free way. Top speed is 90mph down hill. I am sure this is what is causeing or contributing to the poor gas mileage. Any ideas, I would like some input on my idea of the lower gears in the diffs to copinsate for the larger tires. Should the 4.0 be abe to maintain free way speeds with a slite incline in the road in 5th gear with the 33 X 10.5s. My 95 Cherokee 4.0 auto 4x4 stock (except the 30 inch tires) with 140,000 miles will do well over 100mph up hill and is able to pass with ease while geting 18-20 mpg.
TIM

United States

#6 Dec 23, 2006
Should the 4.0 be abe to maintain free way speeds with a slite incline in the road in 5th gear with the 33 X 10.5s WITH THE STOCK GEARS?
TIM

United States

#7 Dec 23, 2006
Should the 4.0 be abe to maintain free way speeds with a slite incline in the road in 5th gear with the 33 X 10.5s WITH THE STOCK GEARS? AT AROUND 25000 to 27000 RPMs

“Drive it like you stole it!!”

Since: Dec 06

Iowa town

#8 Dec 23, 2006
I have a 2003 Wrangler X, 28,000 miles with the 4.0 and a 5 spd and I know it's not getting more than 15 mpg. I really thought it would get better than that since it's so small. I was VERY surprised and not in a good way. My husband is a car salesman and he says that most Jeeps get poor mileage. But I love it anyway!!
jeff

AOL

#9 Jan 22, 2007
how you drive can make a huge difference on your gas milage, drive like a blind 95 year old woman and your milage can go up 3 mpg, dont speed up or slow down fast, also try not to rail on the freeway, jeeps are shaped like a pile of bricks, the faster you go the worse the wind pushing against you is making it harder to maintain speed.
Jack

Tucson, AZ

#10 Feb 20, 2007
TIM wrote:
2000 Wrangler 4inch lift with 33s, 5 speed 4.0 with Jet preformance module and K+N cold air intake with 67,000 miles geting 9-10mpg wih cheep gas and 12mpg with 91 octain. This Jeep was bought this way so I have no idea what kind of gas mileage it was getting stock. I was thinking if I put 4.88s or 4.56s in the diffs this would improve gas mileage? 4th and 5th gears seem to be under powered. I have to push the pedal half way down or to the floor to maintain free way speeds (70-80) if ther is any kind of incline on the free way. Top speed is 90mph down hill. I am sure this is what is causeing or contributing to the poor gas mileage. Any ideas, I would like some input on my idea of the lower gears in the diffs to copinsate for the larger tires. Should the 4.0 be abe to maintain free way speeds with a slite incline in the road in 5th gear with the 33 X 10.5s. My 95 Cherokee 4.0 auto 4x4 stock (except the 30 inch tires) with 140,000 miles will do well over 100mph up hill and is able to pass with ease while geting 18-20 mpg.
Tim,
If you drop 4.56 or 4.88 gears in it, you're milage is only gonna get worse. Right now, if your 4.0 Wrangler has stock diffs, they're around 3.07-3.10...I wouldn't recommend anything steeper than 3.73 or you can kiss your fuel goodbye. The minute you put a lift and oversized tires on a Wrangler, your fuel economy is shot on the freeway. It's shaped like a cinder block to start with, and now you have added to your drag on the undercarriage exposure. Running a 3.73 will help you utilize the power band more effectively, but the best improvement you can make for mileage is pretty spendy. You drop a chevy smallblock in place of the 4.0. My 92, 7" lift, 35's 4.0 Wrangler would get about 12mpg hwy... since the conversion to a 300bhp 350, I get about 20.
josh

United States

#11 Feb 26, 2007
The new wranglers are so ugly im sorry you bought it gag. You should take it back and cut your losses. You know the fram is thinner than a tj's right? The more electrical you have the more problems you will encounter. FOOLISH
RSW

Virginia Beach, VA

#12 Mar 3, 2007
Regarding Fuel Mileage:
I have an '01 Wrangler, 3" Lift, 32" x 11.5" tires. The tranny is a 3 speed auto with torque lock-up above 45 mph. Got rid of the stock air filter and box, for a large open element filter. Running 60 mph I can get 17 mpg, at anything above 65-70 milage drops to 15. Only when hot footing around town or in 4-wheel drive do I drop below 15. If I had a 5-speed, could probably do a little better in all catagories.
My '84 CJ7, with 4.2L, 2-barrel carb, stock springs, 30" tires, and 5-speed could get 21 MPG on freeway.
Peter Ruptert

Cortland, NY

#13 Mar 8, 2007
TIM wrote:
<quoted text> I have the same year and it only gets 10 mpg have you found out whats causing this???
the fact that your fuel air mixture is to rich
Tony V

Camarillo, CA

#14 Mar 12, 2007
Get a Vacuum Gauge you dummies. If you guys invested in a vacuum gauge it would let you know if your air/fuel ratio is efficient to get good gas mileage when pressing and holding the gas pedal at various speeds/gears and weather conditions.

My 2 cents...
WCW

Westford, MA

#15 Jun 1, 2007
I have a '92 Wrangler Sahara, a 4 inch lift with 33 tires, and a totally stock engine. My gas millage is low, but ith the big tires and lifted body im not surprised. What engine upgrades and do to improve my gas millage.
joe zuz

United States

#16 Jun 27, 2007
TIM wrote:
2000 Wrangler 4inch lift with 33s, 5 speed 4.0 with Jet preformance module and K+N cold air intake with 67,000 miles geting 9-10mpg wih cheep gas and 12mpg with 91 octain. This Jeep was bought this way so I have no idea what kind of gas mileage it was getting stock. I was thinking if I put 4.88s or 4.56s in the diffs this would improve gas mileage? 4th and 5th gears seem to be under powered. I have to push the pedal half way down or to the floor to maintain free way speeds (70-80) if ther is any kind of incline on the free way. Top speed is 90mph down hill. I am sure this is what is causeing or contributing to the poor gas mileage. Any ideas, I would like some input on my idea of the lower gears in the diffs to copinsate for the larger tires. Should the 4.0 be abe to maintain free way speeds with a slite incline in the road in 5th gear with the 33 X 10.5s. My 95 Cherokee 4.0 auto 4x4 stock (except the 30 inch tires) with 140,000 miles will do well over 100mph up hill and is able to pass with ease while geting 18-20 mpg.
Same thing 'cept with the 2.5 4cyl? Is checking the if fuel air mixture is to rich a possible fix/help?
Ovy

Las Vegas, NV

#17 Jul 12, 2007
I own a 2000 Jeep Wrangler Sport totally stock since new, and use it for mostly long drives and off-road (it's got only 30K mi so far). With all-season GoodYear Wrangler (stock) tires inflated at 36-38 PSI, 2 passengers in front (~360 lbs)and full cargo in the back (either with the rear seat removed or folded and approx. 300 lbs stuff),I get exactly what the EPA sticker said: 16-17 mpg in town/unpaved reoad (max. 40 mph) and about 19 on the highway (at 70 - 75 mph).
I found out during a trip to Oregon (their speed limit is 55MPH on highways and 60 on I5), that the economical speed is 55 mph, if you can drive that slow.
Low mileage could be caused by any number of things, starting with tire pressure/profile (all terrain tires? mud/snow tires?) and vehicle profile, up to software settings. It should be worth while experimenting with high-flow air filters, synthetic motor oil 5W/30, diff. types of spark plugs, engine operating temp, etc.- 10 MPG is WAy too low. Hope this is a starting point and helps.
Jim

United States

#18 Sep 12, 2007
I have a 2000 automatic TJ sport 4.0, use it as a commuter 50 miles round trip every weekday. I get around 18.5 mpg. and ive found that going around 65-70 is my best fuel economy
fuel question

AOL

#19 Sep 17, 2007
jsut a question. im looking for a jeep now. i dont want to lift it but i want to put 31's on it. what do you think the mileage would be with a 4 or stright 6. im looking at 01-03's manual only. thanks scott
AvK

Richmond, Canada

#20 Sep 18, 2007
I've owned 3 (currently have a 01 TJ sport - new Sahara comes on Wed.!!) They have all been pigs on gas because of the 4.0 inline 6 (dependable but grandpa's technology)The new 3.8V6 will have better fuel economy.........maybe....

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