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View Poll Results: YOUR AVERAGE MPG?
20 MPG or more 17 8.72%
19 MPG 10 5.13%
18 MPG 17 8.72%
17 MPG 22 11.28%
16 MPG 41 21.03%
15 MPG 33 16.92%
14 MPG 27 13.85%
13 MPG 16 8.21%
12 MPG 19 9.74%
11 MPG or less 9 4.62%
Multiple Choice Poll. Voters: 195. You may not vote on this poll

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Old 10-15-2012, 10:08 AM   #31
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Have a 2.5 auto with a/c. All stock drive train and 225-75-15 tires.

My mpg recently swayed dramatically from 10 mpg to over 16 mpg after spending a lot of time and cash making sure everything was in top tune and running condition. It was worth it because I improved my mpg by more then 50%. At $4.35 a gallon it should pay for itself quick. Plus my TJ never ever ran as good as it does now. It's like a totally different Jeep.

Used to get 14-15 mpg then it dropped a couple of months ago to 10-11 about the same time I replaced a muffler. It was record heat so my A/C was running more but I have never averaged 10 mpg before? I checked tire psi, checked brakes to see if they were binding, checked for vacuum and exhaust leaks, did full tune-up, new distributor (worn shaft), new cam position sensor, new IAC, new Mopar 02 sensors, everything. Mpg went up to about 12-13. After that I decided to replace the recently replaced muffler because it had a annoying drone. The muffler must have been undersize or restricted because my mpg went up again to 13-14 mph after replacing the first replacement muffler with a different muffler. I replaced all of my original injectors since they were 16 years old and had over 160K on them. One must have been leaking because there was gas dripping from it. I replaced all 4 with Bosch 4-port injectors. My mpg went up to 15 during the first 2 full tanks of gas after replacing the injectors. I just checked my mpg again after filling up yesterday and I am at 16.6 mpg now. I never ever got 16 mpg in the City before in the 3-4 years I have owned the Jeep. Not sure why so dramatic of a change this time? I removed the battery last week to replace the heater core and A/C evaporator. I wonder if that had something to do with resetting the ECU? No change in driving habits.

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Old 10-15-2012, 10:43 AM   #32
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I have a 1998 TJ with G2 D44's with 5.13 gears, 33-12.20x15 and the 2.5 ltr. I get between 19 and 21 mpg.

I have just finished a trailer for the rig with the 33-10.50 tires and that brings it down to 16 mpg when it's loaded for camping.

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Old 10-15-2012, 10:50 AM   #33
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I was getting a consistent 19 MPG all highway when I had a 100 mile RT daily commute. Got laid off in March of this year and only buy gas every 4-5 weeks now so MPG is not anything I worry about. But to get 19 I stayed under 65 MPH on the interstate and trucks passed me on the long upgrades because I would just lay back to save fuel, especially at almost $4.00 a gallon fuel economy was the most important back then.
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Old 10-15-2012, 10:54 AM   #34
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remember to check for drag to if your mileage isn't up to par. A lot of folks look to why its burning more gas without checking for drag.

2 things, first is the tires. A couple pounds low can really take a hit over long trips because of the extra drag. Second, check the brakes. Sitting flat in N, a single person should be able to push the jeep by hand and make it roll a little. If you can't, jack up one tire at a time and try to spin it. Something may be dragging somewhere, I've seen a lot of times where the littlest piece of gravel will stick a brake caliper and cause all kinds of extra drag. They'll also heat the rims up crazy. If any rim is hot to the touch, you've got something dragging.
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Old 10-15-2012, 10:59 AM   #35
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97 2.5 5 speed. stock axles, 32" tires 22-26 mpg.
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Old 10-15-2012, 11:00 AM   #36
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Quote:
Originally Posted by tallzdatank
97 2.5 5 speed. stock axles, 32" tires 22-26 mpg.
Why do i doubt this?
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Old 10-15-2012, 11:24 AM   #37
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2004 Sport on 33s with 3.73 gears averaging about 12mpg around town if I keep my foot out of it.

Haven't been on a road trip yet so I have no idea on hwy mpg.
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Old 10-15-2012, 12:23 PM   #38
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1999 SE on 31s with a 4 banger (4.10 gears)

I get on average 15 to 16 around town. I think about 16 to 17 hwy.
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Old 10-15-2012, 04:07 PM   #39
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my 2001 4.0 5-speed 33's & 3.73's gets 1-2 mpg better if I run 100% gas instead of 10% ethanol blend.Several local stations sell it for 10 to 20 cents more per gallon & the Jeep seems to have more power,pulling hills in top gear easier.Also driving over 65 or big headwind costs 2-3 mpg.This Jeep got 20 mpg+ when new & stock
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Old 10-15-2012, 04:15 PM   #40
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not sure what my average mpg is, but i am pretty sure it is lower than the average mpg/day threads that are started on this forum...
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Old 10-15-2012, 05:04 PM   #41
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97 tj. 4.0, auto, 3.07, 35s. get about 10-11 haha. Its not my dd so I dont worry to much.
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Old 10-15-2012, 05:09 PM   #42
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My Rubi always got 13mpg no matter how i drove. Well it started getting worse so i decided to check out the spark plugs i put in 20,000 miles ago. The gap was at .045 when i pulled them out.

Now i run factory NGK plugs and all is better. So everyone with sucky mileage check your spark plugs.
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Old 10-15-2012, 05:15 PM   #43
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Quote:
Originally Posted by Moabrubi View Post
My Rubi always got 13mpg no matter how i drove. Well it started getting worse so i decided to check out the spark plugs i put in 20,000 miles ago. The gap was at .045 when i pulled them out.

Now i run factory NGK plugs and all is better. So everyone with sucky mileage check your spark plugs.
x2

The I6 likes plugs... If you're getting crappy gas mileage (even for a Jeep) check your plugs.
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Old 10-15-2012, 07:16 PM   #44
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Quote:
Originally Posted by 02Prove

x2

The I6 likes plugs... If you're getting crappy gas mileage (even for a Jeep) check your plugs.
And dont get the cheapest or the most expensive. Find a good middle line plug ie. platinum or double platinum
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Old 10-15-2012, 08:20 PM   #45
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Quote:
Originally Posted by Moabrubi
My Rubi always got 13mpg no matter how i drove. Well it started getting worse so i decided to check out the spark plugs i put in 20,000 miles ago. The gap was at .045 when i pulled them out.

Now i run factory NGK plugs and all is better. So everyone with sucky mileage check your spark plugs.
Ngk factory thought champion were?
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Old 10-15-2012, 08:28 PM   #46
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Ngk factory thought champion were?
According to the service manual, on my 05 NGK ZFR5N are factory plugs. It runs much better with the NGK than the fancy plugs that were in there.
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Old 10-15-2012, 08:34 PM   #47
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Huh I don't have a service manual anyone know the factory plugs in a 98 4.0 i6
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Old 10-15-2012, 09:53 PM   #48
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Quote:
Originally Posted by 98 tj sport
Huh I don't have a service manual anyone know the factory plugs in a 98 4.0 i6
Just goggled and came up with this NGK plug
ZFR5J-11 NGK
but autolite AP985 are a good choice
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Old 10-15-2012, 10:04 PM   #49
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I used to get good MPG (14-18) on average for a while... I recorded it on an app for my iPad that I use for music in my Jeep and keep records of fixes and expenses and records.

Now I get on average 11.5 MPG...!!! It's crazy... I need to change out my O2 sensors and check my fuel injectors cause of some error codes the Jeep is giving me. But you can see the difference in mpg from my info.

***IMPORTANT - I did flood my Jeep in a river offloading earlier so there is a gap that I did not keep records of MPG because my iPad sat underwater for about 10 min since it was in the Jeep with me... So it took me a while to buy a new one to keep records on.
Luckily I had it all backed up to my computer.



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Old 10-16-2012, 12:01 AM   #50
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Quote:
Originally Posted by sevenservices View Post
remember to check for drag to if your mileage isn't up to par. A lot of folks look to why its burning more gas without checking for drag.

2 things, first is the tires. A couple pounds low can really take a hit over long trips because of the extra drag. Second, check the brakes. Sitting flat in N, a single person should be able to push the jeep by hand and make it roll a little. If you can't, jack up one tire at a time and try to spin it. Something may be dragging somewhere, I've seen a lot of times where the littlest piece of gravel will stick a brake caliper and cause all kinds of extra drag. They'll also heat the rims up crazy. If any rim is hot to the touch, you've got something dragging.
You are totally right about drag.

My friend's mpg dropped from 14 to 11 when one of his front brake calipers was tight. The wheel was very tight and did not roll without a lot of effort when off the ground. That rotor was 30-40 degrees hotter then the other. I thought that might have been my problem but it was not. Mine was probably a combo of things like restricted muffler and leaking injector.
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Old 10-16-2012, 12:43 AM   #51
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When the 35's went on it dropped about 3 mpg. When the 4.88's went in it came back to about 17. That is GPS miles.
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Old 10-16-2012, 08:22 AM   #52
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Pretty steady 14 MPG in mixed driving. Probably 40-45% highway, 55-60% city.
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Old 11-08-2012, 11:21 AM   #53
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Don't mean to resurrect this thread, BUT.....

I JUST GOT 19 MPG (CITY/HWY ABOUT 50/50)!!!!!

Problem is I changed two variables.

1. I bought ethanol free gasoline
2. I changed my driving habit, meaning I "drive like an old man". I accelerate slowly and shift before my tach hits 2K.

I will purchase regular gas (10% ethanol blend) and repost results.

Also, I know my book says my tank holds 19 gallons, but when I filled up at the pump at half empty, I was only able to get 7.5 gallons into the tank?

So the question is, do I really have a 19 gal tank or a 16 gal tank?
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Old 11-08-2012, 11:59 AM   #54
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'05 LJ 6-speed, 33x10.50 MTs, 3.73s, 3" lift
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Old 11-08-2012, 11:59 AM   #55
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Quote:
Originally Posted by TJS2000
Don't mean to resurrect this thread, BUT.....

I JUST GOT 19 MPG (CITY/HWY ABOUT 50/50)!!!!!

Problem is I changed two variables.

1. I bought ethanol free gasoline
2. I changed my driving habit, meaning I "drive like an old man". I accelerate slowly and shift before my tach hits 2K.

I will purchase regular gas (10% ethanol blend) and repost results.

Also, I know my book says my tank holds 19 gallons, but when I filled up at the pump at half empty, I was only able to get 7.5 gallons into the tank?

So the question is, do I really have a 19 gal tank or a 16 gal tank?
The gas light goes on with 3 to 4 gallons left i believe. Shift under 2k? Cant even do that in my 4 banger haha
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Old 11-08-2012, 01:50 PM   #56
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The gas light goes on with 3 to 4 gallons left i believe. Shift under 2k? Cant even do that in my 4 banger haha
I will admit it takes me a while to get to 55MPH. Everyone behind me always looks pissed. Wander why? LOL.
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Old 11-08-2012, 01:53 PM   #57
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I prefer to count gallons to miles.
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Old 11-08-2012, 05:48 PM   #58
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Old 11-08-2012, 06:21 PM   #59
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I JUST HIT 22 MPG by "driving like an old man". Traveled 165 miles (mostly hwy) on 7.5 gallons of has. Didn't go above 55 MPH, accelerated slowly keeping tach below 2k. Used regular unleaded.

I'm happy.
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Old 11-08-2012, 07:24 PM   #60
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