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Old 01-15-2013, 02:25 PM   #1
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11 mpg

2000 Wrangler Sport. I6 automatic 3.07 gears 31x10.50 tires. Aluminum wheels. 42,000 miles. Hard top. No change from winter to summer gas. 165 miles filled up with 15 gallons. 11 mpg seems low. Suggestions? I know my optimal gearing is 3.73 for 31's will revering help my MPG.

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Old 01-15-2013, 02:31 PM   #2
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Is this consistanly or just one time? drive over 65 a lot? go up any big hills?

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Old 01-15-2013, 02:39 PM   #3
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That's pretty bad. I get ~13mpg in my TJ on 37's and 4.88 gears in mostly city driving. Check plugs, air filter, oxygen sensors, etc. Basic tune up items.
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Old 01-15-2013, 02:46 PM   #4
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Constantly. All in town driving some interstate. I've replaced plugs, air filter, the only thing I haven't down is oxygen sensors.
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Old 01-15-2013, 02:47 PM   #5
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Not many big hills.
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Old 01-15-2013, 02:47 PM   #6
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Quote:
Originally Posted by Imped View Post
That's pretty bad. I get ~13mpg in my TJ on 37's and 4.88 gears in mostly city driving. Check plugs, air filter, oxygen sensors, etc. Basic tune up items.

I get 15 plus with 33's and 4.10's mostly city driving. I agree with imped.

I also note that I "feel" like I am getting better milage now after swaping out my fuel pump last week. I will have to drive a bit to see for sure. Did you change out your spedo gear?
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Old 01-15-2013, 02:48 PM   #7
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I also saw a 2 mpg jump when I switched my O2 sensors
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Old 01-15-2013, 02:49 PM   #8
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How many are there? Any suggestions on brands for replacements?
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Old 01-15-2013, 02:49 PM   #9
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Yea im running 35's and 4.88 and im seeing 13 city 15 highway...Check tire pressure?
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Old 01-15-2013, 02:50 PM   #10
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I'm not sure if the speedo gear was switched . It had 31's when I bought from the PO
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Old 01-15-2013, 02:50 PM   #11
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Yea im running 35's and 4.88 and im seeing 13 city 15 highway...Check tire pressure?
Tire pressure is good
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Old 01-15-2013, 03:07 PM   #12
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I also saw a 2 mpg jump when I switched my O2 sensors
How many O2 sensors are there? Where are they located? Specific brand recommendations ?
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Old 01-15-2013, 03:13 PM   #13
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You might want to check your speed against a GPS. If there is a big difference between the Jeep speedo and your GPS indicated speed then your milage traveled will be off as well. The speedo gear may need changed to get an accurate assessment of your actual MPG.
I had an S10 with a 350 V8 and larger diameter tires and it was off 10 MPH and the MPG was much less because of the large tire diameter.
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Old 01-15-2013, 03:54 PM   #14
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Try ethanol free fuel, my 2000 gained about 2-3 mpgs after the first fill-up.
Look around town or use google to find stations that sell ethanol free.
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Old 01-15-2013, 04:00 PM   #15
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One thing about 3.07 gearing with even a slightly oversize tire... your engine RPMs are too low, they are below the engine's most efficient power band, so it'd be hard to get decent mpg.

That said, you'd be old and gray (like me ) before you would recoup the $1200-1300 cost of regearing from better mpg. That said again, you'd sure like the improved performance with a more appropriate axle ratio like 3.73.
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Old 01-15-2013, 04:08 PM   #16
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I have an 06 LJ 4.0 with 3.73 and an auto and "31" inch tires (that actually measure out to be about 30 inches) and i usually get about 16... thats probably 70% hwy, 30% city and I haven't noticed any difference between driving styles... meaning when i drive more "spirited" my M's Per G dont go down and I attribute this to the "power band" Mr. Bransford mentioned above. If I go much below 70 on the highway the engine gets below 2K RPM and especially if you get to a hill you can really tell its lugging.

When i go to bigger tires lower gears will absolutely have to be in the budget - i even think with keeping the OD off it would be pretty miserable.
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Old 01-15-2013, 04:24 PM   #17
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Quote:
Originally Posted by nick_marcil
Try ethanol free fuel, my 2000 gained about 2-3 mpgs after the first fill-up.
Look around town or use google to find stations that sell ethanol free.
The only one aroud here is $4.19 vs $3.29 unfortunately
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Old 01-15-2013, 04:32 PM   #18
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Quote:
Originally Posted by Jerry Bransford
One thing about 3.07 gearing with even a slightly oversize tire... your engine RPMs are too low, they are below the engine's most efficient power band, so it'd be hard to get decent mpg.

That said, you'd be old and gray (like me ) before you would recoup the $1200-1300 cost of regearing from better mpg. That said again, you'd sure like the improved performance with a more appropriate axle ratio like 3.73.
Hi Jerry. Thx for the reply. I have been putting off the regear because the cheapest quote I received was $1200 however I would like the improved performance ill add this to my long list of dream upgrades
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Old 01-15-2013, 05:04 PM   #19
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Quote:
Originally Posted by Jerry Bransford View Post
One thing about 3.07 gearing with even a slightly oversize tire... your engine RPMs are too low, they are below the engine's most efficient power band, so it'd be hard to get decent mpg.

That said, you'd be old and gray (like me ) before you would recoup the $1200-1300 cost of regearing from better mpg. That said again, you'd sure like the improved performance with a more appropriate axle ratio like 3.73.
What is the engines most effcient power band RPMs?
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Old 01-15-2013, 05:22 PM   #20
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wow so i really know i have something wrong because i only get 10 maximum my 2005 lj automatic,and that's with compensation for my speedo
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Old 01-15-2013, 05:36 PM   #21
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I have a 97 sport - 31 x 10.50" Wranglers - 3.07 gearing with 166,XXX miles. Mostly suburban driving, not as much 70 mph, a lot of it at 40-55. I'm fairly easy on the skinny pedal off the lights and my (running) average is 14.63 mpg (non snow plow - trail ride tanks.) Keep in mind if you want to go to 4.10 gearing you'll need new carriers (more money.) I think it would be cheaper to put a set of used SE axles (4.10 factory) under it.
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Old 01-15-2013, 08:55 PM   #22
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How many O2 sensors are there? Where are they located? Specific brand recommendations ?
You have 4 oxygen sensors, 2 for cylinders 1-3 exhaust, and 2 for cylinders 4-6 exhaust. That's not likely the problem on such low miles.
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Old 01-15-2013, 10:17 PM   #23
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I have 2 O2 sensors on my 97
1 is pre cat and 1 is post cat. I know 97-99 only have 2
Not sure when the switch to 4...
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Old 01-15-2013, 10:40 PM   #24
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I'm getting around 10mpg around the city with a little wheeling... TJ on 42's, 5.13 gears.
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Old 01-15-2013, 10:51 PM   #25
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I'm getting around 10mpg around the city with a little wheeling... TJ on 42's, 5.13 gears.
This is encouraging
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Old 01-16-2013, 12:32 AM   #26
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I get 10-11 MPG normally with 3.73 and 33's on a 3.5" lift, mostly city. Highway I get 11-12 MPG. Im not sure how normal that is for my stock gears, but whatever its worth
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Old 01-16-2013, 04:21 AM   #27
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You said 15 gallons filled up? I thought all TJ's have 19 gallon tanks? Mine does and I'm getting 13 mpg.
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Old 01-16-2013, 05:47 AM   #28
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I'm getting about 15 1/2 to 16 mpg in my stock 4 cyclinder 95% of the time its city driving.
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Old 01-16-2013, 07:05 AM   #29
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You have 4 oxygen sensors, 2 for cylinders 1-3 exhaust, and 2 for cylinders 4-6 exhaust. That's not likely the problem on such low miles.
You do. The OP does not.
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Old 01-16-2013, 07:29 AM   #30
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Quote:
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You said 15 gallons filled up? I thought all TJ's have 19 gallon tanks? Mine does and I'm getting 13 mpg.
It was not completely empty

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