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Old 11-23-2012, 11:34 PM   #1
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What gas milege should i be getting?

I have a 2005 Jeep Wrangler Rubicon. It has a 4" lift and 33" mud terrain tires. I drive almost entirely in the city. Most engine and exhaust parts are OE as far as I know. What MPG should I expect to get?

Over the last 4 fill ups I've been getting 11.2 average

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Old 11-23-2012, 11:38 PM   #2
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Sounds about right to me. Most of my driving was highway when mine was a daily driver and I could get almost 19 if I didn't get caught up in traffic. I didn't like spending $120 a week in gas so I opted for a commuter car for the to and from work drives. It saves me about $80 a week that pays for the car and money left over for Jeep parts.

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Old 11-23-2012, 11:39 PM   #3
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05 Rubicon, stock gears, 32" tires, 6spd manual I get 13mpg no matter what I do.

I've found that when i stopped calculating mileage it doesn't hurt as much.
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Old 11-23-2012, 11:42 PM   #4
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If your speedometer wasn't recalibrated for the larger tires, you're getting slightly better mileage than that. Check the speedo against a GPS if you have one, or following someone with them driving a set speed. If it's off, it'll be off by a percentage. For instance, mine is off 10%. If my speedo shows 50, I'm actually gong 55. If it shows 60, I'm doing 66, etc...

Then you'll need to adjust your miles driven per the odometer to the actual miles driven to figure your fuel mileage.
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Old 11-23-2012, 11:42 PM   #5
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I have 12jku, 6sp, 3inch 33tires and get 15 city and 17 on my latest trip home. Top down I get much less.
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Old 11-23-2012, 11:49 PM   #6
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Quote:
Originally Posted by s14sh3r
If your speedometer wasn't recalibrated for the larger tires, you're getting slightly better mileage than that. Check the speedo against a GPS if you have one, or following someone with them driving a set speed. If it's off, it'll be off by a percentage. For instance, mine is off 10%. If my speedo shows 50, I'm actually gong 55. If it shows 60, I'm doing 66, etc...

Then you'll need to adjust your miles driven per the odometer to the actual miles driven to figure your fuel mileage.
Valid point. I know my speedo is off, but I assumed since the tires are only 2" bigger than stock it wouldn't throw the odometer off too much. Without actually doing any calculating, how much do you think that could throw it off?
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Old 11-24-2012, 12:25 AM   #7
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I feel like it really depends on how you drive it. I have a 4.0L 5 spd stick, 4" SA lift with 33" KM2's and I get 15 city 17 highway driving it nice and easy. If I drove it like a sports car, sure I would get about 11. Before the lift with 30" A/T's I was getting about 17 city 19-20 highway.
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Old 11-24-2012, 12:30 AM   #8
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I have an 04 sahara with 31s and 2.5 inch lift and I get 12 - 13 city and around 15 highway. No matter how much I baby it I can't seem to get better mpg. My friend has a throttle body spacer and cold air intake and says that helps some.
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Old 11-24-2012, 12:32 AM   #9
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Quote:
Originally Posted by K.wag
I feel like it really depends on how you drive it. I have a 4.0L 5 spd stick, 4" SA lift with 33" KM2's and I get 15 city 17 highway driving it nice and easy. If I drove it like a sports car, sure I would get about 11. Before the lift with 30" A/T's I was getting about 17 city 19-20 highway.
I do not drive it like a sports car at all... I keep the rpms under 2k, except when accelerating when I let them get to 2.5k or less. I am pretty light on the pedal almost all the time, I don't think this is a big factor for me.
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Old 11-24-2012, 12:34 AM   #10
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Quote:
Originally Posted by JReed615

I do not drive it like a sports car at all... I keep the rpms under 2k, except when accelerating when I let them get to 2.5k or less. I am pretty light on the pedal almost all the time, I don't think this is a big factor for me.
Put some seafoam in it..
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Old 11-24-2012, 12:37 AM   #11
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Put some seafoam in it..
Ehhhh I would be leery of putting seafoam. It will probably make his mileage go down until he changes his 02 sensors.

OP, try new spark plugs if you haven't changed them in a while.
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Old 11-24-2012, 01:03 AM   #12
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In response to the question how much can your speedo be off - mine is off 9%
I only went from stock tires to 31's. I just figure 10% for easy math. Example: speedo says 30, actually going 33. Says 60, going 66.
I used a speedometer gps app for my phone to figure it out. Kind cool, it's a digital speedo for your jeep.
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Old 11-24-2012, 01:23 AM   #13
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Originally Posted by Jeepn Again View Post
In response to the question how much can your speedo be off - mine is off 9%
I only went from stock tires to 31's. I just figure 10% for easy math. Example: speedo says 30, actually going 33. Says 60, going 66.
I used a speedometer gps app for my phone to figure it out. Kind cool, it's a digital speedo for your jeep.
A procal will fix that... lol
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Old 11-24-2012, 03:11 AM   #14
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Quote:
Originally Posted by orngcrushrgrl

A procal will fix that... lol
A new speedo gear is the best option
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Old 11-24-2012, 03:32 AM   #15
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You must have an automatic? If so that sounds in the ball game.
I have owned three LJ's all lifted including one Rubicon, and they all varied from 10.5-15mpg in town depending on weather and a bunch of other things...
If you are looking for better mpg, and have not changed your spark plugs in 36K, I would do so.


Things that at times made slightly noticeable differences were
1. Spark plugs every 36K(I used Champions)..
2. Air Filter replacements as needed.
3. Checking tire air pressures.. IF mileage was my target. 28-30lbs. 33-35' tires 32 lbs was too bouncy for me. I try to run 28lbs usually.
4. Trans service, at least every 36K for me.
5. Oil changed every 3-4k depending on hwy alot.
6. And of course all other fluid services as scheduled by Jeep.
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Old 11-24-2012, 09:28 AM   #16
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Originally Posted by UnlimitedLJ04

A new speedo gear is the best option
Its a rubicon.
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Old 11-24-2012, 09:34 AM   #17
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Quote:
Originally Posted by JReed615

Valid point. I know my speedo is off, but I assumed since the tires are only 2" bigger than stock it wouldn't throw the odometer off too much. Without actually doing any calculating, how much do you think that could throw it off?
Mine is an 04 5spd.. I get 17 on country roads going about 55. Long trips loaded with gear, 14 maybe.. Empty, @ 65, 18.. With 33s add 6% on your miles driven. I've checked it several times with known mileage, and with very accurate GPS on flat roads.. 6 miles more per hundred must be added for accurate MPGs
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Old 11-24-2012, 09:42 AM   #18
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I have 33" KM2's on my '03. 4.0 L, 4 speed auto trans and 4.88 gears. Speedometer is right on with a 41 tooth gear. I get right at 15 MPG.
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Old 11-24-2012, 10:17 AM   #19
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Doing some quick and dirty calculations, your speedometer could be off by 6%. If you drive 200 miles and average 11.2 mpg, that's 17.85 gallons. Add in the 6% and your actual mpg is 11.8, which still seems pretty low to me.
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Old 11-24-2012, 10:59 AM   #20
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Like someone else mentioned use a GPS to figure out the difference between your odometer and actual distance traveled. Mine is off by 10% with 165/75 16 tires.

Also make sure your spin the math right. Don't just look at your odo and then divide by the tank capacity. I have found that my empty light goes on when I still have three to four gallons in the tank.

So what I do now is take odo read, add 10% and then divide by how much fuel I'm able to put in the tank during the full up shown on the receipt.

Ex: odo shows 250 miles. 250x.1=25. 250+25=275. 275/14.8=18.58. Rounded up 18.6 MPG.

Hope that helps.
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Old 11-24-2012, 11:44 AM   #21
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Old 11-24-2012, 01:07 PM   #22
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well, with 33's (BFG TA/KO) and 4.10's before I swapped my speedo gear 1 mile registered 1.2 on the clock, and I was 10 miles an hour off. Now with it swapped 1 mile is dead nuts 1 mile and miles an hour is dead on verified with GPS and Golden Eagle. I have not checked my milage since the speedo swap but before I was @ 14 MPG. With the 235's and 3.07 I was rolling with 18 MPG.

I was going to check mine last night as I was the DD, but I spent more time on the interstate running 2500 RPM's and 75-78 MPH so I don't think it will be accurate, as I normally cruize at 60-65 and 2200 RPM.


...97 4.0, 5 speed, hard top with 3 200 pound men.
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Old 12-01-2012, 01:55 PM   #23
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01 wrangler 4.0/5spd
33x12.5x15 tires
3" lift front/2" rear (both just spacers)
3.73 gears

11.6mpg city/15.3 highway
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Old 12-01-2012, 02:07 PM   #24
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Quote:
Originally Posted by JReed615 View Post
I do not drive it like a sports car at all... I keep the rpms under 2k, except when accelerating when I let them get to 2.5k or less. I am pretty light on the pedal almost all the time, I don't think this is a big factor for me.
Lugging can cost you mileage. Don't be so quick to up-shift. Pick your speed and a gear to run @2,000 RPM for a tankful. In the end, Jeeps aren't economy cars. Good luck.

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