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Old 06-26-2009, 10:57 PM   #1
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Oompa Loompa Bad Mileage

Dear Jeepsters Out In Jeepland:

I'm a new Jeepster. I have a 6 cylinder 2001, manual shift Wrangler. It has 33 inch tires that are REALLY, REALLY, wide.

My mileage is truly shameful: 12.25 MPG. So, in general, does anybody have any suggestions ?

Secondly, what about my tires ? If I change to much narrower tires what kind of mileage change might I expect ?

Thanks for your expertise.

ML in MD

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Old 06-26-2009, 11:31 PM   #2
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Change possible bad driving habits is one major thing other then that not a lot you can do.

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Old 06-27-2009, 01:19 AM   #3
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I have a 2006 with a 6" lift and 35's and get 14.x MPG.

I think you are right in there for MPG. Keep you foot off the firewall and do some maintenance (plugs, air filter, etc).
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Old 06-27-2009, 01:26 AM   #4
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Ooompa Looompa doopity dee. That's what you get when you drive a Jeep.



Sorry... 'couldn't resist.

Unh huh... Admit it! You guys were singing along!
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Old 06-27-2009, 01:29 AM   #5
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Whatever Dorothy.
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Old 06-27-2009, 01:35 AM   #6
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Stop letting the Loompas drive.
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Old 06-27-2009, 02:09 AM   #7
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Hell man consider yourself lucky. When I took mine from DD to trail rig only I was getting a whopping 9 mpg.
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Old 06-27-2009, 02:15 AM   #8
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change your spedometer gear, that will help, i bet that when the PO put the bigger tires on they did not change out the spedometer gear. it will make your odometer off and make you think you are getting worse gas mileage.
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Soon to come mods: 4" full traction lift, 4.56 gears, 35X10.50R15 boggers, 35X12.50 cooper st tires, spooled rear end, and much more.
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Old 06-27-2009, 08:05 AM   #9
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Not a whole lot you can do - 'jeep' and 'good gas mileage' are mutually exclusive.

I usually get around 14ish in combined driving, so again you're in the ball park. Someone else on this forum put it best, IMO (sorry dont recall who deserves the credit):
Quote:
It has all the aerodynamics of a barn door, what do you expect?
Some add ons might help - I think my cat back exhaust helped a little, but it will take a loooong time and a lot of driving to recoup the cost. Finally at risk of kind of hijacking the thread, does anyone know if/how much a cold air intake helps?
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Old 06-27-2009, 09:17 AM   #10
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I got a 4 banger with narrow 33s (10.5) and i get 16 mpg max.... its a jeep dude get use to stoping for gas often
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Old 06-27-2009, 10:44 AM   #11
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change your spedometer gear, that will help, i bet that when the PO put the bigger tires on they did not change out the spedometer gear. it will make your odometer off and make you think you are getting worse gas mileage.
new to jeep too lesst han a week , i was cheking this morning on my way to work at 65mph indicated i was at 72 mph on gps. i filled up the tank and after 68 miles (indicated) im almost at half tank.
speedo is wrong, jeep have bad mpg but not that bad.
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Old 06-28-2009, 12:52 AM   #12
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Quote:
Originally Posted by Loic View Post
new to jeep too lesst han a week , i was cheking this morning on my way to work at 65mph indicated i was at 72 mph on gps. i filled up the tank and after 68 miles (indicated) im almost at half tank.
speedo is wrong, jeep have bad mpg but not that bad.
wow, im at 100 miles before a half tank, do a search for the speedometer gear on here to see if you can find any link to see which gear you need.
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2002 wrangler, stock 4.0, auto, 33X12.50 maxis buckshot, AEV Highline Body kit, Ford 9 inch rear end.
Soon to come mods: 4" full traction lift, 4.56 gears, 35X10.50R15 boggers, 35X12.50 cooper st tires, spooled rear end, and much more.
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Old 06-28-2009, 02:14 AM   #13
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The bigger tires shouldn't be too much of a problem. they can mess up the speedo, but I don't think they'll mess you mileage THAT much.

Think of a bicycle. the bigger tires, the more surface area, and the more distance you cover with one revolution. the only thing bringing it down would be weight causing your engine to work harder hence less mileage.
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Old 06-28-2009, 08:38 AM   #14
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I have no maintenance history on the jeep, I need to get a full service done on it , it has 135k miles. I got last night some new spark plug, kn oil and air fliter and will do an oil change. the rest I'll have to bring it to a mechanic, I live in an apartment complex and they do let us do mechanic. the car is leaking some oil a bit. and never start the first time. I need to crank it a few seconds, turn it of and try again and then it start?!! I did the seafoam treatment last night but use only half the bottle, people report a lots of some coming out the pipe, I didn't noticed anything except in the engine compartment..


as far as the mpg, I'll just drive one day with a full tank and set my gps to check the distance, then fill up the tank and double check the usage vs the miles to see what it is exactly.
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Old 06-28-2009, 08:43 AM   #15
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Ooompa Looompa doopity dee. That's what you get when you drive a Jeep.



Sorry... 'couldn't resist.

Unh huh... Admit it! You guys were singing along!
Ok, these guys have always freaked me out!! Now I'm going to have nightmares!!!
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Old 06-28-2009, 08:58 AM   #16
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These things are supposed to get good mileage? I would think with the mods you have and mileage that's about right.... You can always trade it in on another Jeep...



Sorry.... couldn't resist... good luck on fixin
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Old 06-28-2009, 11:19 AM   #17
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The bigger tires shouldn't be too much of a problem. they can mess up the speedo, but I don't think they'll mess you mileage THAT much.

Think of a bicycle. the bigger tires, the more surface area, and the more distance you cover with one revolution. the only thing bringing it down would be weight causing your engine to work harder hence less mileage.

But if you are useing milage to figure your gas milage
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Old 06-28-2009, 11:28 AM   #18
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Quote:
Originally Posted by Loic View Post
I have no maintenance history on the jeep, I need to get a full service done on it , it has 135k miles. I got last night some new spark plug, kn oil and air fliter and will do an oil change. the rest I'll have to bring it to a mechanic, I live in an apartment complex and they do let us do mechanic. the car is leaking some oil a bit. and never start the first time. I need to crank it a few seconds, turn it of and try again and then it start?!! I did the seafoam treatment last night but use only half the bottle, people report a lots of some coming out the pipe, I didn't noticed anything except in the engine compartment..


as far as the mpg, I'll just drive one day with a full tank and set my gps to check the distance, then fill up the tank and double check the usage vs the miles to see what it is exactly.

take that K&N back and grab a wix for your filter.
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1977 Cherokee ChiefEdelbrock 1406, 33X12.50, front 1.5 inch shackle lift. AMC 360, th400 Quadra-Trac
2002 wrangler, stock 4.0, auto, 33X12.50 maxis buckshot, AEV Highline Body kit, Ford 9 inch rear end.
Soon to come mods: 4" full traction lift, 4.56 gears, 35X10.50R15 boggers, 35X12.50 cooper st tires, spooled rear end, and much more.
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Old 06-28-2009, 12:06 PM   #19
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How can anything shaped like a brick, get good gas milage?
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Old 06-28-2009, 12:19 PM   #20
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hey , I have a Discovery II which is also like a brick or should I say a pallet of bricks LOL
on the Disco I get about 15 to 17 mpg. but I didn't bought it to save on gas either.
it will only concern me if the mpg is way down which show that there is something wrong.

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