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MPG questions

3K views 33 replies 20 participants last post by  InvisiblePants 
#1 ·
I have a 2001 Wrangler 4.0L that I just bought and I thought that I would get around 18 MPG on the highway. I'm not even getting close to that. It has 73,000 miles on it and I'm not real sure if its had the plugs and wires changed yey or not or even if that will help. Could someone give me some tips on how to get better gas millage from my Jeep? Thanks.
 
#2 ·
What are you getting and how are you calculating it. Does it run fine on the highway.

I can get 18-19 on my 4 banger but I MUST keep it at the speed limit and run the truck lanes on hills or else it drops a lot.
 
#11 ·
Very difficult question to answer. Do you have stock gears, tires or have there been alterations? A totally stock Jeep may get 16 to 18 mpg on the highway in good driving conditions. Any tire size changes affects the odometer along with the mileage. Also, the gas gauge is not the most accurate thing ever made either so you certainly can not just eyeball it and think you are accurate. Do what Neil says but if you have larger tires the odometer is going to read incorrectly. Try a GPS for accurate reading.
 
#17 ·
A full tank of gas last 4-6 weeks if not more......wait I have been unemployed for almost a year. No wonder........

For over 21 years I drove 100 miles a day commuting and when i stopped driving it like it was a sports car my mpg was a constant 18-19 mpg. Sometimes is sucked being the slowest vehicle on the interstate but after a while I did not care. I had to fill up every 3 days and when gas went well over 3 a gallon it really hurt the wallet.

When I drove like a maniac I had to buy gas every second day or else I would not make it home.
 
#18 ·
I have an 04 Rubi and get 18.5MPG hwy and can get as high as 21MPG its all about how you drive it.

- Shift early don't go over 2000 rpm with each shift I am in 5th gear before 40MPH. slow acceleration.
- Stay Light on the pedel.
- on the Highway speed is your enemy the faster you go the more gas is needed to push the jeep through the air. I will go 65 MAX with Cruse on

- Check your plugs make sure there gapped right.
- Run some SEAFOAM addtitive throuh the Gas tank to clean the injecters and valves.
- Check your Air cleaner.
 
#20 ·
Also people have reported improvements after changing the upstream O2 sensor/sensors.

I'm installing a new upstream tonight after school.

Thats a bit expensive don't you think? Perhaps you should check the cheaper things like how your driving it how you drive it is the #1 reason for poor gas milage taking it up to 3500 RPM with the pedal to the floor then shifting is the most common reason for poor MPG. #2 is speeding anything more than 60 and your using alot more fuel to get that post office box on wheels through the air. if your not getting codes returned by the computer most likley your O2 sensors are fine and its an ID10T error. :banghead:
 
#22 ·
Way back when I got my '04 Sport with 3.73s and "stock" tires, and 5 speed manual with 4.0...and I drove 55mph it would get 22 mpg consistently...and saw 24 mpg a FEW times.

Small lift, different bumpers, and 31" tires, mileage went to 19-21 highway and 17-19 around town.......now......... more lift, 33" tires, and it is down to 15-17 mpgs...but it sure is fun...IDK highway mpgs it doesn't go there much anymore.....
 
#23 ·
Speed is the killer on jeeps....what is your highway speed? Anything above 65 and it's a slippery slope. I drive ~70mph and I've never gotten above 17mpg....and my jeep is perfectly in tune...runs awesome. It just sucks gas....that's the life of a jeep owner. We drive a 4wd vehicle powered by a tractor engine.
 
#29 ·
i would change the oil and plugs ( your jeep should have a distributorless coil rail setup, meaning there are no wires to change), i would also check your tire pressure( it makes a big difference , i noticed 3mpg gained with increased pressure in my wifes honda on a recent 800 mile road trip) ... also my jeep gets the best gas mileage at around 50 mph ... if you cant handle poor gas mileage a jeep isnt a good vehicle for you to drive everyday, especially not a wrangler, consider a 4cyl econo car for a daily driver.
 
#32 ·
My TJ is entirely stock except for 31" BF Goodrich All Terrains. With the 4.0 L and 5-speed manual. Around the city I get 12-14 MPG. On the highway for long treks I was getting better MPG.

It's all about how you drive it.
 
#33 ·
Absolutely is about how you drive it.. I had the same set up and was getting 18 on avg. When I bumped up to M/T 33s and a 4" lift I still get 15-16.
12-14 with near stock lift is hitting the skinny pedal pretty good. Hope you are at least having fun with it.
 
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