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Old 06-27-2010, 06:19 AM   #1
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TJ Rubicon bad gas mileage

Im just curious is 200 miles/tank a good gas mileage? Approximately 13 mpg highway is that normal? My previous TJ SE was getting gas mileage than this and I thought 4cyl and 6cyl was getting the same gas mileage?

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Old 06-27-2010, 07:20 AM   #2
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Thats about the range I get on most tanks. I have done better also, + I have a LJ.

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Old 06-27-2010, 07:41 AM   #3
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I have the LJ and I get about 225. Not nearly enough for what I use it for. I need to carry about 6 jerry cans. I would like to find a take to bolt behind the rear seat
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Old 06-27-2010, 08:19 AM   #4
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I get 180-200 as well, so I think you are in the right ballpark.
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Old 06-27-2010, 09:03 AM   #5
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Was the speedo upgraded (Idk, what they do to Rubi's, it's a flash I think, rather than a gear) when the big tires went on? If not then the odo is off....
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Old 06-27-2010, 09:21 AM   #6
Knows a couple things...

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Yep, if the speedometer has not been recalibrated, you are traveling more miles/going faster with bigger tires than the odometer and speedometer is indicating.
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Old 06-27-2010, 11:04 AM   #7
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Yep, if the speedometer has not been recalibrated, you are traveling more miles/going faster with bigger tires than the odometer and speedometer is indicating.
I do not think this is true. I thought there is a seperate mechanism at play for the odometer.
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Old 06-27-2010, 11:07 AM   #8
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I get about 15mpg with me 2.5
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Old 06-27-2010, 11:17 AM   #9
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i get about 12 mpg with 4.0 and 37" my speedo is 3mph hour lower than what i really am going so i get alittle better than what my odo. is showing
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Old 06-27-2010, 12:34 PM   #10
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I get about 20 mpg with 31" MT/R in my Rubi. Part of that is driving habits. Do this, fill up at a gas station till it clicks (don't top it off). Make a trip of a known distance ending somewhere and fill up again (same thing, don't top off). That shows how much gas you used, and you know the distance already, don't use the odometer.
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Old 06-27-2010, 12:42 PM   #11
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yea i get about 180-240 miles outta a tank on my 97 4.0 with 33mtz and 3.73 gear ratio
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Old 06-27-2010, 01:07 PM   #12
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I do not think this is true. I thought there is a seperate mechanism at play for the odometer.
Jerry's correct -
The information as to speed and odometer is derived from the sensor on the t-case, then translated by the computer. It simply counts the output shaft's rotation, the computer factors in tire size and gear ratio.

Changing tire size, or axle ratios affect the speedometer and the odometer.

It's a simple thing for the dealer to correct the calibration in the computer.
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Old 06-27-2010, 01:13 PM   #13
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Why would you go to a dealership when the minimum charge is $95 (as seen listed on their wall. That is what they charge just for looking at something) when you can get a calibrator and do it yourself? It will cost a couple of bucks more, but you can reprogram it so that it is right every time you get new tires. I doubt the dealer would get it right on the first time.
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Old 06-27-2010, 04:39 PM   #14
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I'm running 33's on a 4" lift and get 14-16mpg and about 200-215miles out of a tank.

Now if I remember correctly you have 35's.... that will throw it off if not regeared and if the speedo wasn't recalibrated as well like mentioned above.
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Old 07-01-2010, 11:59 PM   #15
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Yep, if the speedometer has not been recalibrated, you are traveling more miles/going faster with bigger tires than the odometer and speedometer is indicating.
How do I get my speedo calibrated? Dealership?
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Old 07-02-2010, 12:03 AM   #16
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Holy crap now I know why...I drove the jeep with a flat tire!!! No wonder...I drove back all highway as well and I was averaging 17mpg. I don't understand how I could get a flat tire. All tires are good no holes and plus I just got the vehicle not even 2 weeks ago.
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Old 07-02-2010, 12:47 AM   #17
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I used to get around 200 a tank and i filled up when the gas light was on.
now that i realized i have a bigger tank that's a 19 gallon and not a 15 i got around 270 a tank
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Old 07-02-2010, 04:46 PM   #18
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I get about 16 in town and didn't account for the larger tires so I don't know. Per the odometer, at 185 I buy gas. Also the gauge says it's empty, always a hint of when to buy.
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Old 07-02-2010, 05:04 PM   #19
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Have you considered taking it to the place where you purchased it and asking them to correct your speedometer?
At no charge of course, since the mileage listed when you bought it is certainly inaccurate.

Oh and, I have the same Y/M/M as yours, I get 10.5 mpg. You're doing great.
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Old 07-02-2010, 05:58 PM   #20
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I get around 13-15 mpg in town.
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Old 07-02-2010, 07:54 PM   #21
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you guys running manuals or autos?

my friend has a 5 speed and 3.73s in a mustanggt and gets gooood mpg because he drives around in 4th @ 45mph @ 1650rpms
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Old 07-02-2010, 07:58 PM   #22
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you guys running manuals or autos?

my friend has a 5 speed and 3.73s in a mustanggt and gets gooood mpg because he drives around in 4th @ 45mph @ 1650rpms
Auto.
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Old 07-07-2010, 09:41 AM   #23
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My '06 Rubicon Unlimited bone stock got at best 13 mpg...
after upgrade to 35" tires, 4.88 gears, a Jet Performance chip and K&N intake, it now gets 11mpg :-P...But it kicks A$$

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