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-   -   poor gas mileage??? (http://www.wranglerforum.com/f282/poor-gas-mileage-244458.html)

itscakes 05-22-2013 08:53 PM

poor gas mileage???
 
Don't know if it's just me or if this is a common thing with jeep wranglers. I am a new jeep owner had it for a week now. I have only gone 208 miles and im on empty. My tank was full when I got the vehicle. To me that doesn't seem like a whole heck of a lot. I have a 2005 4.0 automatic transmission running 31" tires with soft top. About 60 miles of the 208 where done on highway. The only mod that was done by po was a flow master exhaust. I am missing they black plastic tube that connects to the air filter box and intake so I have a pretty decent opening in my air filter box, but buddy of mine said that wouldn't effect mpg. How many gallons is this gas tank and is this a normal amount of mpg for this year? Thanks for the help

Jowen 05-22-2013 09:02 PM

Not sure bout how many gallons the tank is but the gauge in the wrangler can't be depended on. Are you sure it was completely full? With mine completely full ill go over 100 miles before the needle moves; thought it was busted the first time it happened. Fuel up all the way; drive; fuel up again and take miles driven divided by gallons burned to know your exact mileage. By the way congrats on the new jeep.

Atthehop 05-22-2013 09:05 PM

Quote:

Originally Posted by itscakes (Post 3783420)
Don't know if it's just me or if this is a common thing with jeep wranglers. I am a new jeep owner had it for a week now. I have only gone 208 miles and im on empty. My tank was full when I got the vehicle. To me that doesn't seem like a whole heck of a lot. I have a 2005 4.0 automatic transmission running 31" tires with soft top. About 60 miles of the 208 where done on highway. The only mod that was done by po was a flow master exhaust. I am missing they black plastic tube that connects to the air filter box and intake so I have a pretty decent opening in my air filter box, but buddy of mine said that wouldn't effect mpg. How many gallons is this gas tank and is this a normal amount of mpg for this year? Thanks for the help

Do you know how to properly caculate MPG?

itscakes 05-22-2013 09:07 PM

But really sure would imagine take the 208 and divide by however many gallons gas tank is

SeVeReDiStOrTiOn 05-22-2013 09:15 PM

05's have a 19 gallon tank

Fill your tank up and reset trip, the next time you fill up divide miles traveled by how many gallons you just put in.

Dep863 05-23-2013 05:48 AM

Welcome to the club :banghead:

RubiGou 05-23-2013 05:52 AM

Change your spark plugs. Helped me out alot

UpTheCreek 05-23-2013 06:00 AM

Yep, the mileage sucks, especially with an automatic. Not a whole lot you can do about it except change your driving habits a bit. What I have found to help is to not lug the engine and unless you're on the highway above 60 mph, just leave the overdrive turned OFF.

But yeah, good for about 200 miles or so before that low fuel light comes on. At that point, you probably have 4 or 5 gallons left in the tank and if you calculate, I'd bet you're getting 14-15 mpg on average.

Thankfully, I knew this before purchasing. Many don't and figure a Jeep is small and probably good for 18 or 20 mpg. Some are, just not yours or mine!

Atthehop 05-23-2013 06:22 AM

Quote:

Originally Posted by itscakes (Post 3783463)
But really sure would imagine take the 208 and divide by however many gallons gas tank is

I guess you do not. Fill it up, reset the trip odometer, run it low, fill it up and note the number of gallons it took to fill it up, divide the number of gallons (including tenths) into the number of miles on the trip odometer. Now you have the MPG for that tank full.

Do this a bunch of times and you will get a good idea what your getting.

muddy05tj 05-23-2013 07:39 AM

Yupp sounds bout right my 05 6 speed with 31s and nothing else done to it gets bout 210-225 depending on how I drive it till the light comes on which according to everyone on here you still have about 5 gallons left with our 19 gallon tank

free78 05-23-2013 07:43 AM

You said you drove 208 miles. Are you sure there wasn't miles on it already? My needle will not move until around 100 miles. I get anywhere between 300 and 350 out of a tank. When was the last tune up? What kind of driving do you do, highway, stop and go? What kind of gas are you using? Mine is a 97, manual, 4.0 with 31x10.50s.

Atthehop 05-23-2013 07:50 AM

It amazes me how many people calculate MPG by guessing how many gallons the tank holds and what they think they utilized. Maybe if the manufacturers did it that way they can exceed the CAFE requirements.

timboburks 05-23-2013 09:58 AM

[QUOTE=free78;3784701
My needle will not move until around 100 miles.[/QUOTE]

Wow! Must be nice. I think my needle drops while I am filling it up. Kinda like trying to fill a bucket with a hole in it.

Water Dog 05-23-2013 10:08 AM

The other thing to consider, is if you have oversized tires and the speedo gear has not been changed, then both your speedometer and odometer are not giving accurate readings. Check your speedo against a GPS. But as Atthehop said...there's only one way to check mileage.

jeeps4u2nv88 05-23-2013 10:54 AM

I just replaced my spark plugs and O2 sensors this week. Still waiting to see what effect it will have on my MPG. If nothing else, it made the Jeep run smoother. I think the spark plugs were original too so its a big upgrade since the Jeep is a 1998 and has 130,000 miles on it.

Atthehop 05-23-2013 11:14 AM

Quote:

Originally Posted by free78 (Post 3784701)
You said you drove 208 miles. Are you sure there wasn't miles on it already? My needle will not move until around 100 miles. I get anywhere between 300 and 350 out of a tank. When was the last tune up? What kind of driving do you do, highway, stop and go? What kind of gas are you using? Mine is a 97, manual, 4.0 with 31x10.50s.

I wonder what the MPG is at this time. I had a vehicle that the gauge was stuck on full therefore my MPG was fantastic.

overblown 05-23-2013 11:29 AM

Welcome to Jeep ownership!

lonestarLj 05-23-2013 11:31 AM

On my 05 lj auto I have a 4"lift with 33" mud terrains and a lot of other accessories, I usually get about 12mpg or 225miles per tank. But my friend with a regular 05 tj and at's gets 14 or 15 so It depends on a lot of things.

speedyrev 05-23-2013 12:12 PM

I agree with 2 things posted above.
1. I suspect your speedo/odometer is off with those 31's. Check against a GPS. If it's off, you have to fix it or do some math that only my kids know how to do.
2. Use Atthehop's method of calculating MPG mentioned above. It's the only accurate way.

AceOfJade21 05-23-2013 12:23 PM

Right now my stock 2000 Sahara gets a little over 300 miles to the gallon. It takes a while for you to start trusting your mileage over what your odometer says. At first I would fill up around 240-260 miles because the odometer said I was running low. Eventually started figuring out I still had a ways to go until the tank was really starting to empty out

CenTexTJ 05-23-2013 12:29 PM

If the speedo/odo is off because of the tire size you should be able to check your mileage with a GPS. Most of them have an odometer/tripmeter built in now.

fj40jeepster 05-23-2013 12:33 PM

I've been getting 18-20 mpg in my 1999 Sahara, 4.0, 5 spd. After changing the plugs, wires, cap, rotor, oil, & air cleaner, I'm still getting the same, even as the Jeep seems to run smoother with more power. I'm assuming the auto trans sucks a bit of mileage vs a manual. Driving habits also effect mileage. I'm not winning any races in my Jeep so I'm driving a bit slower and more intentional these days!

Welcome to the forum! This is a great resource with helpful information by some experienced jeepers.

Rayko 05-23-2013 12:39 PM

Quote:

Originally Posted by AceOfJade21 (Post 3785474)
Right now my stock 2000 Sahara gets a little over 300 miles to the gallon.

I guess you mean to the tank full:D

AceOfJade21 05-23-2013 01:01 PM

Quote:

Originally Posted by Rayko (Post 3785526)

I guess you mean to the tank full:D

Nope that wasn't a mistake!! Bow down to your Jeeping MPG king!


Lol, whoops!

RevCo666 05-23-2013 01:06 PM

I've given up on fuel efficiency unless its SUPER bad then most likely something is mechanically wrong. Be happy and drive!

MarkGLHS 05-23-2013 03:51 PM

a well tuned 4.0L 5-speed TJ that is mechanically in top notch shape on 30" tires can achieve 18-20 mpg in mixed driving. I'm doing that and I am reading others are also.

your TJ has an automatic and 31" tires, not sure how much MPG you are loosing due to those factors but it is hard to imagine it is dinging you more than 3 MPG.

WVU Mountainman 05-23-2013 03:58 PM

Holy crap. What am I doing wrong. I have I6 2000 TJ 44,000 miles 31x10.50's 2" SL 3.07 gears and I have never got 200 miles before I have to fill up. I typically get 10-12 mpg empty or fully loaded hauling a trailer

sevenservices 05-23-2013 03:58 PM

a low tire or dragging brakes can also reak havoc on mileage... make sure it rolls freely in N, you should be able to push it by hand in N w/it shut off on flat ground.

Atthehop 05-23-2013 04:19 PM

Quote:

Originally Posted by WVU Mountainman (Post 3786101)
Holy crap. What am I doing wrong. I have I6 2000 TJ 44,000 miles 31x10.50's 2" SL 3.07 gears and I have never got 200 miles before I have to fill up. I typically get 10-12 mpg empty or fully loaded hauling a trailer

But how many actual miles are you driving between fill ups and how many gallons is it taking to fill. Sounds like your using best guess like a lot of OP's.

Vigilante Justice 05-23-2013 04:23 PM

I'm getting 16 MPG pretty consistently.


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