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Old 07-02-2009, 02:16 PM   #1
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Question Mpg ??

I didn't buy it for the MPG but what can i expect? 1998 4.0L 31" tires

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Old 07-02-2009, 02:23 PM   #2
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14to16 mpg's on the road.

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Old 07-02-2009, 02:35 PM   #3
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14to16 mpg's on the road.
Around that
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Old 07-03-2009, 02:09 PM   #4
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I wish
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Old 07-03-2009, 02:11 PM   #5
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That is "on the road" highway... JD...it will be 12 or so city.

If your getting less than that you need a tune up. Also...idling to let the a/c cool it off before you get in sucks some gas that you can't add into your MPG.
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Old 07-03-2009, 02:16 PM   #6
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I get between 12 and 20 depending on how i drive and the wind. Head wind is like 12 mpg.
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Old 07-03-2009, 02:56 PM   #7
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mines 12 or less highway I don't even want to think about city
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Old 07-03-2009, 03:26 PM   #8
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I got about 3 inches of lift on 32's with 3.73 gears .. soft top (adds drag) .. and I still can get 16 mpg easy. I imagine if i didn't have these heavy ass MT/Rs and put the hard top on it'd be even better.
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Old 07-03-2009, 03:35 PM   #9
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Got the 30,000 tune up. Has 47,000 on it now and gets about 11.5 highway. 60 miles round trip to the track = 1/4 tank. 19 gallon tank. do the math
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Old 07-03-2009, 03:45 PM   #10
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I get around 12-18 depending on how I drive and what i have on or off (doors, hard top soft top ect)
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Old 07-03-2009, 05:27 PM   #11
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I've got a 4" lift on 33s M/T. I was getting 14 MPG. Then, we flushed the radiator, put on a new muffler and Skeeter got his Grand Cherokee running again (so he's not driving my jeep) and now I'm getting 15-16 mpg. That's mostly city driving. We took my top off about a week ago, we'll see what that does to mpg.
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Old 07-03-2009, 05:43 PM   #12
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Quote:
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I got about 3 inches of lift on 32's with 3.73 gears .. soft top (adds drag) .. and I still can get 16 mpg easy. I imagine if i didn't have these heavy ass MT/Rs and put the hard top on it'd be even better.
I am in the same scenario with M/Ts. Before when I had 30's I could get 18.2 on most tanks. With the lift,32s,etc I average 16.1 on most trips. Most of my driving is 30 mile round trip to work on open back roads and the usual aroundtown errands. A lot of the mpg has to do with the acceleration and the progression through gears. When I turned over my suburban to my teenager the mpg dropped 1.9 within 2 tanks. And he swears he drives just like me
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Old 07-03-2009, 06:35 PM   #13
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Quote:
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Got the 30,000 tune up. Has 47,000 on it now and gets about 11.5 highway. 60 miles round trip to the track = 1/4 tank. 19 gallon tank. do the math

But is your tank accually have 19gal in it? It is common for the 19gal tanks to kick the pump off around 14gal in the tank...stinks but it happens. 11.5mpg highway is horriable for your jeep on 31's. Try to run the math from the number of gallons that the pump says you put in the tank. Write down how many gallons you put in the tank and the current mileage "time 1", drive until you need to fuel again,,, get current mileage and amount of fuel filled on fill 2.

This will give you a pretty good estimate on what the fuel mileage for you LJ is. 11.5 is very poor for highway mileage in your jeep.

Hopefully your issue is that you need to do the fuel tank "mod".

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Old 07-03-2009, 06:53 PM   #14
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I'm usually running at 75-80 mph and topless. Could those factors make that big of a difference?
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Old 07-03-2009, 06:58 PM   #15
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YES!.....lol....jeeps suck the petro bad over 65mph. Best fuel consumption is 65 and under for the 4.0. They were never really designed to go very fast. Heck the inline 4.0 is still based off of a 1950 engine design.
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Old 07-03-2009, 07:03 PM   #16
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The speed limit is 70-75 and I'd be spun like a turtle on it's back at 65. Most are doing 85-100. pay to play.
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Old 07-03-2009, 07:11 PM   #17
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pay to play.
Yep. Got to do what you got to do.

The rpm range your in at "70 to 80" is over the point of normal rpm for ideal fuel consumption...will it hurt your engine...naw...just your wallet.

Ideal crusing rpm for the 4.0 is from 2100 to 2300rpm...but this also depends on tire size, gear ratio, etc...
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Old 07-03-2009, 07:16 PM   #18
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On my recent trip to Kentucky I got between 18-20 on the highway. My normal around town is between 12-14.
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Old 07-03-2009, 07:17 PM   #19
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90% of the time I'm on the highway, I'm on my way to Road Atlanta, a road racing course sitting on about 350 acres, lotta infield to play on. So it's well worth the $'s.

Ps. Off thread I know. Just want to say THANK YOU!
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Old 07-03-2009, 08:04 PM   #20
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i usually get around 14 in combined driving (though Im curious if there will be any noticeable difference since I got the new exhaust). Guess I'll have to calc it one of these days and report back.
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Old 07-03-2009, 08:09 PM   #21
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17.5 highway, about 14.5 overall, 65 mph tops. Original motor with 205,000 miles. 31's, no lift, hard top.
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Old 07-03-2009, 08:14 PM   #22
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The way I see it, it is a jeep so I never check what I am getting for mileage. Bottom line they are terrible on gas, but I enjoy every minute that I drive it so it does not bother me much.
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Old 07-03-2009, 10:50 PM   #23
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Cold Tube Addition

I've got an '04 Unlimited 4.0 with automatic 3.73 and 30.5X9.50X15s. Increased the mileage to 18 city and 20 highway with a tube and open K&N filter from Rusty's Offroad. Cost about $100. I've also used the ones from Turbo City on my other Jeeps as well. The more expensive the unit does not necessarily mean it will give you better mileage. Rusty's is the cheapest and easiest to install. Get rid of the box filter with the baffling. Yes, it's a bit noisier but the difference in mileage is noticeable. In my wife's '00 XJ with the 2.5 and 5 speed stick the mileage went to 20 city and 23-26 highway. And that's driving in the mountains of Western Maryland. Hope that helps.
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Old 07-03-2009, 10:58 PM   #24
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in city i get about 16 and on the highway with the back full of stuff for weekend up north i got 18. But i get 16 in city by keeping rpms under 1,500.
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Old 07-04-2009, 07:47 AM   #25
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I just made a 1,000 mile round trip last week, 20 mpg. or better average 65 mph tops. about 2300 rpm 4.0l 30 x 9.50's cruise control most of the way. I expected worse but was very pleased. Now around town, I don't even check!
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Old 07-05-2009, 06:37 AM   #26
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With my 2003, 5-spd, 31x10.5x15, 3.07 axle gearing. Just calculated mpg at 17.4 with mix of interstate, hwy, and city driving.
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Old 07-05-2009, 08:44 AM   #27
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When I first got my TJ (it was used), I checked the mpg by using the odometer. I got around 16-18mpg. Then I bought a gps. Found out my speedo was off. I was going about 2 mph slower than I thought I was, so I was not going as many miles as I thought I was. This gave me great mpg, but incorrect mpg. I was actually getting around 14-16. Now that I have 31s on it I am going faster than the speedo shows by 2-3 mph. I am still getting 14-16 mpg. I have a 6-speed with 3.07 gears.

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Old 07-05-2009, 06:19 PM   #28
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depends mostly on your driving and the conditions (i.e. - stop and go, highway, how fast on the highway)

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