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Old 09-29-2009, 04:22 PM   #1
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Gas Mileage

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?

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Old 09-29-2009, 04:27 PM   #2
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Be happy your getting that much!! That's almost unheard of for a 4.0. Just remember, most performance upgrades also improve gas mileage.

Other than that you can mess with your gearing, depending on your setup, you might be able to squeeze out a few mpg's. But in your case, I would say what ever gearing setup you have must be damn near ideal for mileage. (If those numbers are correct)

You can always alter your aerodynamics though something to make it less brick shaped will really help out your mileage. You will get a few strange looks though...

P.S. I get 15-16 max, but usually around 13-14. This is pretty typical mileage.

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33" BFG A/T's 15" soft 8's
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trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
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Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 09-29-2009, 04:30 PM   #3
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WOW 17-18 pretty good man i would not complain on that one, i have an automatic 4.0 and get right about 220 miles to a full tank (gotta fill up once a week)
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Old 09-29-2009, 04:35 PM   #4
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ya im guessin u are right there at the top...i can usually get about 16 mpg pulled out of mine
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Old 09-29-2009, 04:38 PM   #5
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We should be asking you how to get better mileage! I get about 15. I just cleaned out my fuel system though, so I'll see if that helps a little.
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Old 09-29-2009, 04:41 PM   #6
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Thanks for the responses. I thought my gas mileage was on the lower end, but I guess I was wrong. What would you recommend with a gear change and how much would that cost(including a mechanic to install because I am not very comfortable with messing with the gears)?
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Old 09-29-2009, 04:52 PM   #7
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I have the 3.07 gears and I average 14 to 15 in the city, but I usually get between 200 to 220 on a full tank.
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Old 09-29-2009, 04:55 PM   #8
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Quote:
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Thanks for the responses. I thought my gas mileage was on the lower end, but I guess I was wrong. What would you recommend with a gear change and how much would that cost(including a mechanic to install because I am not very comfortable with messing with the gears)?
Need to know more about your Jeep before we can answer that:

What size tires?
Manual or auto?
What gear ratio do you have currently? (I'm guessing 3.07)

The re-gear route is usually for those with bigger tires, whose mileage and power are suffering. This doesn't sound like the case for you.
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HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 09-29-2009, 05:06 PM   #9
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I get 12 - 14 with 3.73s and 33" tires!
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Old 09-29-2009, 07:04 PM   #10
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10 MPG in town 11.5 highway. 150 miles on a tank if I run it till its empty. I would rather push my Jeep than drive something else. If I want 50 mpg I'll ride my Harley.
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Old 09-29-2009, 07:09 PM   #11
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10 MPG in town 11.5 highway. 150 miles on a tank if I run it till its empty.
How?!?!?
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 09-29-2009, 07:10 PM   #12
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Im at 14-15 in combined driving. Performance upgrades might make a difference, and if they do it will be so negligible that it will take like 20yrs to pay for itself in gas mileage saving. Now if you want it for the extra power, or exhaust tone, go for it, but its tough to make a case for gas mileage alone.
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Old 09-29-2009, 07:16 PM   #13
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Quote:
Originally Posted by ExDementia View Post
Need to know more about your Jeep before we can answer that:

What size tires?
Manual or auto?
What gear ratio do you have currently? (I'm guessing 3.07)

The re-gear route is usually for those with bigger tires, whose mileage and power are suffering. This doesn't sound like the case for you.
I have 30" tires on the jeep now, and it is a manual. I have no idea what the current gear ratio is and where to find that out. Is there an easy way to tell what gear ratio it is?
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Old 09-29-2009, 07:21 PM   #14
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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.
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Old 09-29-2009, 07:25 PM   #15
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Quote:
Originally Posted by jeep95 View Post
I have 30" tires on the jeep now, and it is a manual. I have no idea what the current gear ratio is and where to find that out. Is there an easy way to tell what gear ratio it is?
There is a tag on your differential, scrape it clean. It will say 07 or 73, if your plug is rubber than chances are you are running 3.07. My 04 Sport had an option for the D44.
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Old 09-29-2009, 07:32 PM   #16
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How?!?!?
10 mpg in the YJ with the V8
Couldn't tell ya what the JK gets
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Old 09-29-2009, 07:33 PM   #17
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I get between 7 and 20. Absolutely depends on how and where it is driven.
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Old 09-29-2009, 08:04 PM   #18
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I get 13 to 14 on average. I keep a daily mileage log. I top off my tank every other day when the gauge is at the half empty/full mark. Costs about 20 bucks. I knew what I was getting into when I bought the Jeep. Everyone told me it was a gas guzzler. A tree hugger friend of mine is holding me personally responsible for destroying the planet, but never refuses a ride.

B.
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Old 09-29-2009, 08:12 PM   #19
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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.....
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Old 09-29-2009, 09:59 PM   #20
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'98 Sport 4.0 w 3sp Auto....Dana 44's w/3.73 gears, stock tires..16-17 mpg at best. At 65 mph the engine is near 3000 RPM which is way high in my book but such is life...I love my Jeep!

Bill J.
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Old 09-29-2009, 10:14 PM   #21
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Quote:
Just remember, most performance upgrades also improve gas mileage.
Like what? CAI? TB? They do nothing on a TJ.
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Old 09-29-2009, 10:33 PM   #22
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Quote:
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10 mpg in the YJ with the V8
Couldn't tell ya what the JK gets
Ah, I was thinking of the JK lol
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 09-29-2009, 10:34 PM   #23
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Quote:
Originally Posted by Levinoss View Post
Like what? CAI? TB? They do nothing on a TJ.
Intake, high flow fuel injectors, electric fan, the list goes on...
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1991 XJ Cherokee, 4.0, AW4, NP-242, SYE
HP D30, Rusty's axle truss, Currie HD steering, diff. slider
C8.25, Powertrax locker
4.5" RE up front and Rough Country out back
33" BFG A/T's 15" soft 8's
Suspension seats, rock sliders, plated rear corner panels,
trimmed fenders, CB, exhaust, lights, remote locks and start, etc.
Past jeeps:97 TJ, 99 TJ

Quote:
Originally Posted by Geoff@Bestop View Post
In video games, the bad guy's bullets travel much slower than the good guy's bullets.
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Old 09-29-2009, 10:42 PM   #24
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Intake, high flow fuel injectors, electric fan, the list goes on...
lol

I have some snake oil and beach front property I want to sell you.
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Old 09-29-2009, 10:55 PM   #25
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I fixed my fuel problem today. I put black duct tape over the fuel Gage. I now am sure I get about 35 mpg. Easy fix. Ya just got to use yer head.
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Old 09-30-2009, 04:41 AM   #26
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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.
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Old 09-30-2009, 04:55 AM   #27
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'98 Sport 4.0 w 3sp Auto....Dana 44's w/3.73 gears, stock tires..16-17 mpg at best. At 65 mph the engine is near 3000 RPM which is way high in my book but such is life...I love my Jeep!

Bill J.
That is the plus of 3.07 gears, at 75 I am taching at a little over 2000 RPM's. So while my gearing may not be the best in respects to the tire size I would like to put on, and to some extent wheeling, but it is still my daily driver. The fuel mileage is still terrible, I still love my Jeep to!
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Old 09-30-2009, 06:02 AM   #28
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Yesterday when I filled up the tank, The ODO said 235, and the needle was just in the red. I don't really know what the conversion to MPG is, but I would say that's not to terribly bad. My unmarked detective car is my daily driver, and the Jeep is more of a weekend ride, so I don't have to fill it up that often. I can handle that!
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Old 09-30-2009, 06:36 AM   #29
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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.

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Old 09-30-2009, 07:57 AM   #30
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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

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