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Old 02-28-2010, 12:16 PM
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poor gas mileage

i just bought a 2004 wrangler x 4.0 6 cyl. with 27,000 miles.. it only seems to be getting 14 mpg. my wife drives a gran cherokee with the same motor and it gets 19mpg. does anyone know what it could be? thanks

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Old 02-28-2010, 12:23 PM   #2
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could be alot of things.

does it have bigger tires or anything?

could need a tune up. fuel filter. air filter.

im sure theres more but i cant think of it right now

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Old 02-28-2010, 12:58 PM   #3
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Aerodynamics! You are driving a brick on wheels. Consider yourself lucky at 14mpg.
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Old 02-28-2010, 01:01 PM   #4
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Change all your fluids and air filter. I use all synthetic oils in the drive train. You may want to to change the plugs & wires (little early but can't hurt). Also my want to give it a seafoam treatment (check daily driven tj website).

BTW, welcome to the forum! Now set back and watch the replies come rolling in. Your mileage question will bring in all sorts of answers. throw in Synthetic oil & seafoam, you will really have a bunch of replies.
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Old 02-28-2010, 01:14 PM   #5
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It's cold as heck in most areas...if you live where it's cold, you're going to get worse gas mileage.

I also hear most places add ethanol to the gas during the winter for whatever reasons...even if they don't normally sell gas with ethanol during the summer months. Ethanol decreases gas mileage by a small percentage.
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Old 02-28-2010, 01:34 PM   #6
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Axle ratio? Transmission (auto or manual)? Tires?

Tip: Fold down the windshield for better MPG!!!
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Old 02-28-2010, 01:34 PM   #7
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I too usually average about 14-15mpg.
Sounds normal to me.

Just 'cause it has the same engine as your wife's Grand, doen't mean everything else is the same.... gear/axle/aerodynamic wise, they aren't the same thing.
Like JD said, we have a brick on wheels.
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Old 02-28-2010, 01:52 PM   #8
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If you wanted gas mileage then shoulda got a prius. If you wanted to have fun then you have the right vehicle! I get like 12 if im lucky but I also have a lift and 33's.
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Old 02-28-2010, 02:52 PM   #9
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My wife used to drive a grand cherokee 4.0 6cyl auto,same deal she would get 20 or better,I would get maybe 16 in my wrangler.Its definetly the flat windshield and brick like aerodymamics.Now with my 33" MTR,s and lift,Im lucky to get 12-13 around town,and average 15 highway only.
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Old 02-28-2010, 07:43 PM   #10
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16 mpg tops w 5 spd manual - Usually 14-15 - Sucks, but like someone said - You are driving a square block!!
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Old 02-28-2010, 08:16 PM   #11
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14 isn't too bad. If you get 16 or higher you get some bragging rights
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Old 02-28-2010, 08:29 PM   #12
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I just recently started paying attention to how much gas I was going through and I am averaging like 10 miles a gallon.. I do have 35 inch tires and 488 gears. I dont mind when im just driving around town getting that mileage, but to go anywhere far its depressing watching the gas gauge move before your eyes.

I have been planning a trip to Moab to go mountain bikeing, and do some trails in the jeep, but when I look at what it will take in gas to get there opposed to borrowing my mothers camry...the jeep/mountain bike trip could end up just being a mountain bike trip.
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Old 02-28-2010, 08:32 PM   #13
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Quote:
Originally Posted by JDsDream View Post
Aerodynamics! You are driving a brick on wheels. Consider yourself lucky at 14mpg.
X2 & precisely. 14 mpg is not unusual at all, I wish my TJ got that good of mileage. I feel lucky if I get 13 on a trip.

So even with the same engine, the Jeep is a heavy vehicle that combined with its poor barn-door aerodynamics means it doesn't get good mpg. Especially if you try to drive it 70 mph all the time. Bigger tires also make the mpg worse, so do suspension lifts as both make it harder for the engine to push the vehicle.
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Old 02-28-2010, 08:33 PM   #14
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My 98 sport is stock besides a stainless header
4.0 5speed 3.07 gears on 28.5" tires
19 mpg city,no hills though,all boring flatland

with the stock header i was getting 14mpg but the stock cast header was cracked
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Old 02-28-2010, 08:34 PM   #15
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This winter I am averaging 8.5 mpg. I let the thing sit and warm up every morning and that eats a lot of gas without showing it in mileage.
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Old 03-01-2010, 06:31 AM   #16
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I get better mileage above 7,00 feet!
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Old 03-01-2010, 06:47 AM   #17
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Wow! Did he say 14 mpg? I didn't know Jeep was building hybrid 2004 Wranglers!
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Old 03-01-2010, 09:26 AM   #18
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My wife always gets better mileage than I do, let her drive it
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Old 03-01-2010, 09:44 AM   #19
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I can get 18 or so. but not in the winter...the boss lady starts the jeep up so its warm when we goto work....drops mileage down to 14ish.
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Old 03-01-2010, 09:40 PM   #20
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does anyone know any mods oranything i can do to increase mine?. just curious
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Old 03-01-2010, 10:58 PM   #21
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most mods will only decrease your mpg.. just keep that in mind..unless u go smaller like tires , lift, etc..
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Old 03-01-2010, 11:03 PM   #22
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Quote:
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Aerodynamics! You are driving a brick on wheels. Consider yourself lucky at 14mpg.
I believe that there is a picture floating around somewhere that depicts this principal...... CAIN! Hey Cain, you still got that pic?

Where's Cain when you need him..... That boy is never around when there's work to be done.

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