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Old 03-17-2009, 07:43 AM   #31
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down hill both ways!
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Old 03-17-2009, 08:49 AM   #32
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I noticed the biggest improvement in gas mileage when I replaced the upstream O2 sensor. Make sure that you have good plugs, wires, cap and rotor. My next mod will be an electric fan which will free up some power and hopefully improve gas mileage a bit. Some people also claim that a cold air intake and a throttle body spacer also helps, but I have not tried it yet.

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Old 03-17-2009, 09:25 AM   #33
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My is a 99 6cyl all stock just gave it a tune up and I am getting 19mpg
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Old 03-22-2009, 01:27 PM   #34
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I had a Nissan Titan that got upper 10's in town and max 13 on the highway. Jeep gets 12-15 and I'm tickled pink!

Lot more fun too!
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Old 03-22-2009, 04:40 PM   #35
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my dad used to average 21 mpg on a tank in his '02 with 28" tires and 3.07:1 axles. he gets 23 in his XJ limited with 3.55:1 and 30" tires.

it's all about how you drive

in my current set up I used to get 19mpg cause I was used to driving a $300 honda i was afraid would blow up if i asked it to do anything; now, with the same set up (real lift instead of bb) i get 14mpg, cause i drive it like i want to drive now and don't have to worry about being sans car cause it exploded.
Jeep: Pioneered by a war, popularized by AMC, revived by Chrysler, jacked by some Germans, and copied by all.
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Old 03-22-2009, 04:58 PM   #36
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give it a fresh tune up. on mine all i have to do is change the plugs, i have the coils on plugs...

or try a fuel treatment... i was getting 13, just tried a prodect name called BG Products Inc. look them up on the web,

BG 44K® Power Enhancer®

that is what i just used in my last tank. i still got 13, but this tank i am at 200 miles and have a 1/4 tank left.
1977 Cherokee ChiefEdelbrock 1406, 33X12.50, front 1.5 inch shackle lift. AMC 360, th400 Quadra-Trac
2002 wrangler, stock 4.0, auto, 33X12.50 maxis buckshot, AEV Highline Body kit, Ford 9 inch rear end, 4" full traction lift.
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Old 03-22-2009, 05:03 PM   #37
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Getting the most mileage out of your fuel has alot to do with watching your tach. If you're driving an auto. watch your tach. closely...when it shifts into 3rd gear, look at your speed also...try to keep your speed just above the point where it dropped into 3rd.

It doesn't take a rocket engineer to figure out that the higher the RPM's in any given gear = more fuel comsuption.
Each man must for himself alone decide what is right and what is wrong, which course is patriotic and which isn't. You cannot shirk this and be a man. To decide against your conviction is to be an unqualified and excusable traitor, both to yourself and to your country, let men label you as they may.
-Mark Twain

The impersonal hand of government can never replace the helping hand of a neighbor. -Hubert H. Humphrey
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Old 03-23-2009, 07:37 PM   #38
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Originally Posted by stevens243 View Post
Are those 31 inch tires the stock size tire on your TJ? If not, did you change the speedo gear?

I ask because 20 MPG is pretty much on the far end of the rainbow for TJ's and I can't get anything close to that number.
no, they aren't stock. they rub a little when i turn sharp, but anyway i only got 17-18 before Jeep replaced my motor. But yes i get 20 often which is awesome cause i got 12 when i had my VehiCROSS.

They say that at 100 miles an hour, water feels like concrete... so you can imagine what concrete feels like." -Nicky Hayden

-99' TJ 4.0L 5 speed stock(soon to change)
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