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Unread 08-10-2008, 09:23 AM   #1
stunner
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MPG - List your rig and your MPG

Ok, so I'm curious to see what everyone else is getting on their rig and/or what they've done to help with MPG.

My rig is a 4.0, inline six with 42RLE auto. transmission.

Mine when stock:

15 - 15.5 MPG - Automatic 42RLE, 3.73 gears, 30x9.5 GSA Wranglers

Mine after mods:

11.5 MPG - 3.73 gears, 3-4" lift, 32x10.5 Super Swamper Radials

I lost a whole lot of gas in the mod process which bewilders me.
According to this chart, I should be getting the most fuel economy with 32" tires but, obviously, I'm not.

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Last edited by stunner; 08-10-2008 at 12:10 PM..
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Unread 08-10-2008, 09:32 AM   #2
Moses2564
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The guide is just that, a guide, it doesn't portray actual figures or specific results per mod, being that there can be multiple factors that effect gas mileage.

I'm getting 16mpg on 33x12.50R15 MT and 3" of lift with 4.56 gears. I think I have a cracked exhaust manifold, so hopefully it will go up when I get that fixed.
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Unread 08-10-2008, 09:35 AM   #3
CNY
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Tj. 31" tires. 4.10 gears. Manual transmission.

14mpg.

I saw no change after switching from 3.07 gears to 4.10 gears.
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Unread 08-10-2008, 09:44 AM   #4
hulkboy
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mine gets around 16 still with 33s.. i may have gotten like 17 at the most before lift.. so 1mpg doesnt really bother me.. now before i changed the speedo gear or even knew about a speedo gear i was getting like 11.. did you change your speedo gear?
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Unread 08-10-2008, 09:57 AM   #5
JeSimmers
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4 banger, 4.88's, 33x12.50 I get about 17mpg
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Unread 08-10-2008, 10:09 AM   #6
mike0110
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4.0, 3.73, 33x12.50, 5 speed i get about 17 to 18 by shifting under 2k rpm's
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Unread 08-10-2008, 10:25 AM   #7
iMTB
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05 2.4, 6 speed, 4.10 stock tires with no lift: 18-19 city
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Unread 08-10-2008, 10:30 AM   #8
spyder6
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06 4.0, 6-speed, 4.88's 4.5" Rubicon express lift, 35's, armor. 14 city - 16 highway

when it was stock i had no problem pulling 20mpg

im in the process of acquiring parts for a 4.7L Stroker so we'll see how things turn out with mpg
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Unread 08-10-2008, 11:06 AM   #9
john NC
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2.5" OME, 42RLE 4-speed auto, 3.73 a couple skids, 33x10.5

12-14city which is the majority of my driving, just did a 250 mile trip and got 18mpg with cruise control

Last edited by john NC; 08-10-2008 at 11:22 AM..
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Unread 08-10-2008, 11:12 AM   #10
95BadBoy
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2.5 OME, Auto, 3.73's, 33 x 12.5 -- 11.0 city
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Unread 08-10-2008, 11:19 AM   #11
Jerry Bransford
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That "better" gas mileage column doesn't mean you'll get better overall mileage, it just means you'll possibly get better mileage than with the ratios shown in the other two columns. There's no free lunch where bigger/heavier/harder-to-turn tires under a lifted Jeep encountering more wind resistance is concerned.
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Unread 08-10-2008, 11:20 AM   #12
mcneil
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00' 2.5L 4spd, 4.11 gears, 32" Goodyear MTRs
15-17 mpg combined

Your swampers probably have twice the rolling resistance of the GSAs.
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Unread 08-10-2008, 11:23 AM   #13
vtjeepguy97
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97 4.0L TJ. 4" lift, 31" all-terrains. 18 mpg. Mostly because I drive in the open country. 13 or so city.
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Unread 08-10-2008, 11:28 AM   #14
garthbrown
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'03 with 4.0, manual, 3" lift, 32" tires, 4.10s, lots of city driving and heavy foot - ~12mpg with a hard top on.

Gets about 12.5 with the soft-top. Was getting about 13 before the roof rack, tire carrier bumper, armor, etc.
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Unread 08-10-2008, 11:47 AM   #15
danheit
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97 with a barage of CEL and sensor problems--2.5 ax5 w/4.11's and a 2"bb with stock rubi tires and wheels. 15mpg no matter what. Oh, but I do have one of those new fangled airaid intakes that the PO put on. That must have given me a good extra 40 horses at the rear wheel!
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