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Old 04-16-2013, 10:19 PM   #1
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Fuel mileage

I know jeeps get crappy fuel mileage but mine gets negative crappy. 4" lift, 33"s, 373s, stock air filter and intake, new plugs, usually between 60 and 65 mph and 8 MPG. What gives

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Old 04-16-2013, 10:29 PM   #2
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I know jeeps get crappy fuel mileage but mine gets negative crappy. 4" lift, 33"s, 373s, stock air filter and intake, new plugs, usually between 60 and 65 mph and 8 MPG. What gives
More drag + more unsprung weight + inefficient gearing for 33's = bad mpg

Does your jeep roll like it should off idle? You could have some excess brake drag or bearing issue...low tire pressure? Just some ideas.

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Old 04-16-2013, 10:29 PM   #3
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I have the same problem. I just bought a 2005 TJ, 4" lift, 33" bfgoodrich Mud Terrain T/A's, everything else is stock and I'm only getting about 200 miles to a tank of gas.
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Old 04-16-2013, 10:43 PM   #4
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Originally Posted by panic1780 View Post
I know jeeps get crappy fuel mileage but mine gets negative crappy. 4" lift, 33"s, 373s, stock air filter and intake, new plugs, usually between 60 and 65 mph and 8 MPG. What gives
What plugs did you put in? Proper gearing will help, but it shouldn't be that low. I get 11-12mpg with 3.5" lift on 33's 3.73
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Old 04-16-2013, 10:44 PM   #5
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I'd say the majority of your problem is 33s and 3.73s. Somebody with this set up can chime in but most likely it's shifting in and out of overdrive ( assuming you have an auto) when your going at highway speeds to maintain speed. That will kill gas mileage.
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Old 04-16-2013, 10:45 PM   #6
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Takes off fine, bearings feel good, I did adjust tha emergency break awhile back, 35 psi all tha around
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Old 04-16-2013, 10:45 PM   #7
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33"s, 373s... What gives
what trans, and what speedo gear? did you swap speedo gears when installing the larger tires?
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Old 04-16-2013, 10:46 PM   #8
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Has a 5 speed, sorry, forgot to mention that part
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Old 04-16-2013, 10:47 PM   #9
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Did not swap tha speedo gear
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Old 04-16-2013, 10:59 PM   #10
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Did not swap tha speedo gear
not tryna say i think your dumb but are you factoring in the fact that your mileage is off since you havent changed the speedo gear? i did the same thing but now i realized that instead of getting 212 miles to a tank i'm getting about 237-245 meaning i only lost 15-20 miles off a tank of gas. alot better than the 50 plus gallons i thought i lost. my 3 speed setup with 3.73's probably feels the same as yours though. not horrible low end power in 1st gear but it gets weak around 3rd (or 5th gear for you) only way to fix it is re gear... 4.88's for auto's and 4.56 for your 5 speed i believe
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Old 04-17-2013, 07:38 AM   #11
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Take a look HERE to find the right speedo gear.
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Old 04-17-2013, 07:44 AM   #12
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Are you using the fill tank, record odometer reading, run down tank, fill tank, record odometer reading and then divide miles driven by gallons needed to fill tank. It seems a lot of drivers estimate the amount of gas utilized by the fuel gauge reading (which is not very accurate). Just a question.

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