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Unread 08-16-2004, 11:23 AM   #31
0IIIIII0
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i get 18.5-19.5 mpg with about half highway half city driving. this has been this way since i bought it 3 month ago. 98 4.0 5spd. always shift under 2.5K. i agree w/ the speed, keep it under 75 and shift like a grandma and you will see an increase in mpg.

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Unread 08-16-2004, 11:31 AM   #32
Gritz
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We ave 17.5 w/a 50/50 city/hwy mix. All highway, driven nicely, 20.2 last trip.
One trip all highway from Denver to Moab with a 15-20 mph headwind 3/4 of the way, 15.
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Unread 08-16-2004, 11:32 AM   #33
jmilliron
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I get 15-17 mpg on the freeway with the top down. I have been religious about keeping track of the odometer when I fill up the tank.

2004, 4.0L, 5 speed, with 1,700 miles on it. Not fully broken in yet.

-jason m
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Unread 08-16-2004, 12:47 PM   #34
Supercharged99TJ
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I get between 15.5 and 16 mpg out of a tank. It really doesn't matter..... around town or interstate it always works out in that range. The only time it gets better is lower speed(55mph) highway driving. I recently took a day ride up the Natchez Trace and got around 18mpg out of it. Of course the Jeep has a Rimmer Supercharger, 35" tires and 3.73 gearing.....
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Unread 08-16-2004, 12:48 PM   #35
BigJeepJay
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I have a 2004 X and I range from about 18.6 - 20.4 MPG for my work commute. The only difference that I am doing from stock is using synthetic oil. Though I also get in the 16's for MPG when I do alot of mixed driving away from my regular work route.
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Unread 08-16-2004, 02:52 PM   #36
vanilla_gorilla
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Quote:
Originally Posted by Supercharged99TJ
I get between 15.5 and 16 mpg out of a tank. It really doesn't matter..... around town or interstate it always works out in that range. The only time it gets better is lower speed(55mph) highway driving. I recently took a day ride up the Natchez Trace and got around 18mpg out of it. Of course the Jeep has a Rimmer Supercharger, 35" tires and 3.73 gearing.....

Is the Trace as cool as everyone says it is? I'm hoping next summer to ride it on my scooter when I get back up that way.
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Unread 08-16-2004, 03:00 PM   #37
NautOneFL
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I have been on a cross country excursion with my TJ and saw this thread-

I got anywhere between 18 and 23 (yes 23) MPG going cross country. I have a bone-stock TJ with a k&N in the stock air chamber.

Now I usually got about 19 on the highway keeping the cruise set at 70-75. The 23MPG came in the mountains going slower speeds (55-65). I attribute that to the lower O2 levels and the compensation the computer was making to the fuel/ air mix. For you science nuts out there - I was at 9500 feet in the mountains where there is 40% less oxygen than at sea level where me and my Yeep live most of our lives. 40% less o2 in the air means the computer cust fuel use back 40%.

Anyway this is my experience with a 4.0 I6. Have the calcs and the receipts to prove it too. Will post an overall average for the trip later on the forum.

-J
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Unread 08-16-2004, 03:11 PM   #38
uglyprimate
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I check my mileage like religion. It's the best way to see how your motors health is. Different gas stations will vary heavily on mileage. I average right at 20 with combined city and highway. Heavy city will drop to 18 and best I've ever seen was 23. Tire pressure at about 35psi with 31 all terrains. 4.0 sport with 5 speed and 3.73 gears. Best mileage running 55-60mph with roof up. or up with windows down and rear window up. Mobil 1 in engine and tranny. Flying J truckstop and Sheets gas stations give me best mileage. Exxon will show about 17-18 and Marathon just plain sucks.
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Unread 08-16-2004, 04:16 PM   #39
thebulkinator
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I got 18-9 mpg on my trip down to NC with windows shut, AC on and my father and brother in the jeep along w/ all our crap. If we didnt have the AC on I suppose the milage would have been 20-22. But as long as you have it and its hot as a mofo outside, why not use it?!

Edit: My speed coming back was 75 when following traffic in right lane and sometimes in the left lane I'd look down and see 85-90 and then let off a bit. Didnt see a cop the way back.

Last edited by thebulkinator; 08-16-2004 at 06:27 PM..
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Unread 08-16-2004, 05:10 PM   #40
zquader
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22 mpg, And 317 miles and still a 1/4 tank left
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Unread 08-16-2004, 05:42 PM   #41
AZTJ2001
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My e-brake must be stuck on or something. I spent the last week purposely driving like my grandmother, shifting around 2000 rpm, and staying below 2000rpm except for about a 4 mile stretch on my commute where the speed limit hits 65 (about 2200rpm).
I ended up at 17.8 mpg, and that included correcting for 31" BFG A/T's instead of the stock 30's. I can't drive any slower, how the hell can I ever get over 20mpg? BTW, everything's stock except the tires.
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Unread 08-16-2004, 06:27 PM   #42
thebulkinator
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Quote:
Originally Posted by zquader
22 mpg, And 317 miles and still a 1/4 tank left
Must be a 4cyl and you must stay under 60.
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Unread 08-16-2004, 07:07 PM   #43
alabama sahara
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Well, I tried this theory of driving under 55, and better gas mileage. It worked very well. I was getting 12.5 mpg, checked her yesterday, and 16.9 mpg!!! I was floored! And that is with 33's and a 4" lift. I was proud of her, very proud.

04 Sahara 4.0 auto
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Unread 08-16-2004, 07:59 PM   #44
motorola_mike
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After I put a AEM Brute Force Air Intake my mileage jumped almost 2 mpg to 19.5. I run Mobile 1 and drive nearly 1/2 my time on the highway.
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Unread 08-16-2004, 09:27 PM   #45
julietkilo
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I have seen 23 mpg. No BS either. Since i broke in the new Jeep (check my sig) I have seen a vast improvement with the new K&N and the small gears (for now). I keep a very real account of my gas mileage. Check this page out on my website. http://www.thefertigs.com/jeep/mileage.html

The more the engine breaks in the better the gas mileage. I am using 10-W30 oil no special addiatives. Just the K&N. Now if my jeep was 5 years old or more i could see that number being less. New vehicle = good gas milage ???

My vehicle had 500lbs of crap in it when i got 23 mpg. That was with 85 octane and a bunch of highway miles.
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