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Old 09-30-2009, 08:10 AM   #31
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Originally Posted by jeep95 View Post
I have recently purchased a 2000 Jeep Wrangler 4.0L 5sp and get about 17mpg or 18mpg on a good day. I realize it is a wrangler and will get bad gas mileage, but is there a way to improve the gas mileage? What gas mileage are you other wrangler owners getting?
That's the same as what I'm getting. I'm happy with getting that. I'm running stock tires now, but planning on upgrading to 31's soon. I hope it doesn't affect it much.

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Old 09-30-2009, 08:36 AM   #32
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I have a couple of questions:
There is no tag on my rear differential so how do I tell what ratio is in it?
I'm going to change the front and rear differential fluids...I know the book says use MoPar fluid but I also know there are a lot better products out there.
How about synthetics?
I'm also going to change the tranny fluid....suggestions on fluids?

2003 Black Saraha
4.0, 5-speedseries
2" Procomp suspension lift
32x9.50's on black, Mickey Thompson Signature Classic II

Thanks for any help

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Old 09-30-2009, 08:47 AM   #33
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Originally Posted by jeep95 View Post
I have recently purchased a 2000 Jeep Wrangler 4.0L 5sp and get about 17mpg or 18mpg on a good day. I realize it is a wrangler and will get bad gas mileage, but is there a way to improve the gas mileage? What gas mileage are you other wrangler owners getting?
ok, I hate to be one of those guys, but seriously, did you think to search? this has been discussed to the point of death and back.

If 17-18mpg isn't good enough sell it and buy a Prius.

jcjdesco, I still get 17 on 31's...don't think it has a huge impact.
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Old 09-30-2009, 08:49 AM   #34
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Originally Posted by mistert View Post
I have a couple of questions:
There is no tag on my rear differential so how do I tell what ratio is in it?
I'm going to change the front and rear differential fluids...I know the book says use MoPar fluid but I also know there are a lot better products out there.
How about synthetics?
I'm also going to change the tranny fluid....suggestions on fluids?

2003 Black Saraha
4.0, 5-speedseries
2" Procomp suspension lift
32x9.50's on black, Mickey Thompson Signature Classic II

Thanks for any help
I went with Lucas gear oil, why? it looked interesting.

On the transmission, I put in Pennzoil Syncromesh (I have NV3550)

According to Currie, synthetics in the diffs should be avoided. but according to others it really doesn't matter. so go with what you want.
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Old 09-30-2009, 10:44 AM   #35
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wow i'm kinda surprised. i dont drive my jeep as hard as most. if anything i baby it and i'm hitting 22-25MPG! 4.0l and a automatic
Hmmm very curious how are you getting 22-25mpg out of a 4.0 w/ an Auto???
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Old 09-30-2009, 11:03 AM   #36
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My jeep does very well on gas, I get around 20 mpg or a little more! I just shift at 2200 RPMS and dont ever floor it!!
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Old 09-30-2009, 11:53 AM   #37
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Quote:
Originally Posted by mistert View Post
I have a couple of questions:
There is no tag on my rear differential so how do I tell what ratio is in it?
I'm going to change the front and rear differential fluids...I know the book says use MoPar fluid but I also know there are a lot better products out there.
How about synthetics?
I'm also going to change the tranny fluid....suggestions on fluids?

2003 Black Saraha
4.0, 5-speedseries
2" Procomp suspension lift
32x9.50's on black, Mickey Thompson Signature Classic II

Thanks for any help

The tag has to be there next to the filler plug, But according to the specs I found. The Sahara is running 3.73, here is a link I found.
Compare 2003 Jeep Wrangler Sahara 2dr 4x4 Specs and Equipment With 2003 Chevrolet Tracker Hard Top LT 4dr 4x4 Hardtop
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Old 09-30-2009, 12:03 PM   #38
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I want to borrow you calculator!
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Old 09-30-2009, 01:13 PM   #39
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loose weight and you'll save gas.....
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Old 09-30-2009, 03:13 PM   #40
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lol

I have some snake oil and beach front property I want to sell you.
JPmagazine.com dyno testedpower increases and mpg records. They even proved that the throttlebody spacer adds HP
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Old 09-30-2009, 03:24 PM   #41
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JPmagazine.com dyno testedpower increases and mpg records. They even proved that the throttlebody spacer adds HP
The fact there are so many variables that effect fuel economy and horse power in the real world makes those tests not realistic in my opinion and many many many others. Throttle body spacer does jack shit on a TJ and same goes for the Cold air intake.
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Old 09-30-2009, 03:47 PM   #42
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The fact there are so many variables that effect fuel economy and horse power in the real world makes those tests not realistic in my opinion and many many many others. Throttle body spacer does jack shit on a TJ and same goes for the Cold air intake.
Jeeps are not aero-dynamic, and thus gas guzzlers. When you commit to a Jeep, you also accept the realities of it's poor fuel economy. I can't imagine there is too much that can be done about a Wranglers poor gas mileage.

B.
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Old 09-30-2009, 06:54 PM   #43
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Originally Posted by popa View Post
The best I got with mine (2000 TJ 4.0 liter, manual, 3.07 ratio - I guess - stock tires) around 15 mpg. On a site: Jeep 4.0 liter six cylinder engine I found that the best should be 18mpg. Does anyone reached this performance? Do I have a problem with mine (after I've cleaned the injectors and changed the oil, filters, spark plugs, etc)?
I know that one doesn't buy a Wrangler for the mpg but here, in my country (and Europe, in general), when you pay 1.2$ per liter, you start thinking on the gas mileage, too.
The highest mpg I have reached in my 2000 wrangler 4.0L is 18.2mpg. I usually average around 16mpg-17mpg, so you are not that far off of my average.
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Old 09-30-2009, 06:59 PM   #44
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The only reason to re-gear would be if you had done a lift with bigger tires, to try getting back some milage as well as power.

If your getting 18mpg, be happy then and don't mess with anything.

Do you have 4cyl or 6cyl. with the manual and 30's???

Spending money on the performance things never really payoff for a Jeep. It's not made or intended for that.

Chris

I have a 6cyl with a five speed manual transmission and 30 inch tires. I am pretty sure that it has stock gears, but I am not positive because I am not the original owner.
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Old 09-30-2009, 07:02 PM   #45
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ok, I hate to be one of those guys, but seriously, did you think to search? this has been discussed to the point of death and back.

If 17-18mpg isn't good enough sell it and buy a Prius.

jcjdesco, I still get 17 on 31's...don't think it has a huge impact.
I did search, but none of the threads have really said anything about possible upgrades to better fuel economy. I am perfectly fine with 17-18mpg, but I wanted to know if anyone was getting anything better and how.
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Old 09-30-2009, 07:05 PM   #46
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I avg. about 18.5 mpg between highway and city. It's a 04 Rubicon manual with a 6" lift, full body and belly armor, 35" tires and 4:88 gears.
How do you do that well at getting good gas mileage? I would have thought that the lift and tires would have destroyed your aerodynamics and fuel economy.
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Old 09-30-2009, 08:45 PM   #47
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I really don't know why my milage is that good. It's my DD and I don't drive it like I stole it but I don't baby it either. As far as aerodynamics go IT'S A JEEP! It never had any aerodynamics to begin with.
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Old 09-30-2009, 09:15 PM   #48
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The fact there are so many variables that effect fuel economy and horse power in the real world makes those tests not realistic in my opinion and many many many others. Throttle body spacer does jack shit on a TJ and same goes for the Cold air intake.
Lol, even dyno tests aren't good enough for people...

Oh and btw the Mopar intake/throttle body spacer combo made 14hp and 12tq more than the stock airbox. When were talking about upgrades for the 4.0, that's substantial. Check out their site, they also test like 9 others and plenty of other performance upgrades. I don't think they are out to trick anyone here...

Honestly, I was in the same boat you are, physics say a throttle body spacer should do nothing on our jeeps but after I saw the dyno results I accepted them. (A throttle body spacer does alot more for a 2.5 anyway.)

Oh and BTW, I never said any performance upgrade made a big or even noticeable difference sometimesin mpg's, I was just stating a general car fact. And I also never said some of these performance upgrades are worth the money for the gain you get. (Trying to be overly clear here to prevent any more arguing)
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In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 09-30-2009, 09:27 PM   #49
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I never said any performance upgrade made a big or even noticeable difference
Waste of money then
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Old 09-30-2009, 09:33 PM   #50
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Yes, Mopars $400 intake/throttle body spacer combo is a waste, but I would not rule out all performance upgrades.

And I stated those to prove that they actually do "jack shit" as you so succinctly put it.
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Old 09-30-2009, 09:37 PM   #51
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Yes, Mopars $400 intake/throttle body spacer combo is a waste, but I would not rule out all performance upgrades.

And I stated those to prove that they actually do "jack shit" as you so succinctly put it.
I still stand by my previous comment that they do jack shit for us.
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Old 09-30-2009, 10:30 PM   #52
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What about 4 bangers? Just got mine with a manual tranny, haven't driven it long enough to see what I'm getting, replaced a 91 civic hatch with 185k and 40 plus mpg. Looks like I'm gonna be in for an adjustment with my fuel funds.....
my four banger averages a tad over 21. it has 30 inch tires and 4.11 rear end and is a manual. not bad? i thought it was pretty decent. To improve fuel economy on it switch gears sooner.

I dunno if im the only one who does this but cruising around town i put it in 5th for any speed higher then 30 mph. i think this is a reason i don't use to much gas.
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Old 09-30-2009, 10:59 PM   #53
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We have a 98 w/4.0L 5spd, 31 in. tires. All oils are Schaeffer's. It's my DD. Back & forth to work (45 mile round trip) I average 19 - 21 mpg, depending on the amount of wind. Couple week ago, we did a day trip of 260 miles averaged 22+ mpg included was about 120 miles on the interstate at 70 - 80 mph. I use 85 octane gas most of the time, but will put 92 octane for a planned longer trip. I will use alcohol blend in bitter cold weather, but mileage goes down the tubes real fast with the alcohol blend!

I don't know if it makes a difference, but I will skip gears depending on conditions/circumstances. 1-3-5 or 1-2-4-5, getting to 5th ASAP with out lugging the engine. I also use Lucas gas treatment on most tanks, add Sea Foam every 3rd or 4th tank, and run sea foam directly through throttle body every other month or so. At the same time I also wipe out the TB with a paper towel after spraying carb cleaners in it.

This works for me, might not work for everybody.
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Old 09-30-2009, 11:00 PM   #54
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I've decided to go green!
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Old 09-30-2009, 11:19 PM   #55
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Much better
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Old 10-01-2009, 09:13 AM   #56
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be carefull with carbs cleaner, it will eat up any rubber seals it come in contact with !
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Old 10-01-2009, 10:06 AM   #57
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I've decided to go green!
Sweet!
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Old 10-01-2009, 04:24 PM   #58
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I really don't know why my milage is that good. It's my DD and I don't drive it like I stole it but I don't baby it either. As far as aerodynamics go IT'S A JEEP! It never had any aerodynamics to begin with.
Do changing the gears in the axles make that much a difference in power and economy. How much does it cost to get them?
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Old 10-01-2009, 10:53 PM   #59
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I average 20mpg most of the time if I aint 4wheeling. highest was 21.7mpgs. best gas mileage improvement you can make is to drive with an egg on the gas pedel. we learned that back in the gas crissis. when your on pavement sit back and cruise. shift when the light comes on, and slowly winde the gears to the shift light then shift, on the interstate stay arround 60-65.
otherwise keep good sparkplugs and wires in it and a clean air filter and the oil changed. and learn what air preasure will give you a full inflated tire with a good solid footprint. and when you 4wheel air down and then air up for the pavement.
Hay the kids are grown and I aint in that big of a hurry to go any place, so I put on some good tunes and roll along in the right lane. and with gas in the $2.25 range I drive arround 20K a year so gas costs isnt high enough to fool with any performance upgrades unless you want the high performance from them.
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Old 10-05-2009, 01:14 AM   #60
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Why the complaint again?? On a good day I get about 14 (4.0 auto), but it's usually around 12 or 13. And heck I'm looking at possibly getting maybe 1 or 2 more mpgs on it lol

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