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Topic Review (Newest First)
03-23-2009 06:37 PM
600RRJeep250F
Quote:
Originally Posted by stevens243 View Post
Are those 31 inch tires the stock size tire on your TJ? If not, did you change the speedo gear?

I ask because 20 MPG is pretty much on the far end of the rainbow for TJ's and I can't get anything close to that number.
no, they aren't stock. they rub a little when i turn sharp, but anyway i only got 17-18 before Jeep replaced my motor. But yes i get 20 often which is awesome cause i got 12 when i had my VehiCROSS.
03-22-2009 04:03 PM
Mike B. Getting the most mileage out of your fuel has alot to do with watching your tach. If you're driving an auto. watch your tach. closely...when it shifts into 3rd gear, look at your speed also...try to keep your speed just above the point where it dropped into 3rd.

It doesn't take a rocket engineer to figure out that the higher the RPM's in any given gear = more fuel comsuption.
03-22-2009 03:58 PM
crazyredneck give it a fresh tune up. on mine all i have to do is change the plugs, i have the coils on plugs...


or try a fuel treatment... i was getting 13, just tried a prodect name called BG Products Inc. look them up on the web,

BG 44K® Power Enhancer®

that is what i just used in my last tank. i still got 13, but this tank i am at 200 miles and have a 1/4 tank left.
03-22-2009 03:40 PM
TeeJay my dad used to average 21 mpg on a tank in his '02 with 28" tires and 3.07:1 axles. he gets 23 in his XJ limited with 3.55:1 and 30" tires.

it's all about how you drive

in my current set up I used to get 19mpg cause I was used to driving a $300 honda i was afraid would blow up if i asked it to do anything; now, with the same set up (real lift instead of bb) i get 14mpg, cause i drive it like i want to drive now and don't have to worry about being sans car cause it exploded.
03-22-2009 12:27 PM
routemanj I had a Nissan Titan that got upper 10's in town and max 13 on the highway. Jeep gets 12-15 and I'm tickled pink!

Lot more fun too!
03-17-2009 08:25 AM
jnaugle775 My is a 99 6cyl all stock just gave it a tune up and I am getting 19mpg
03-17-2009 07:49 AM
nater344 I noticed the biggest improvement in gas mileage when I replaced the upstream O2 sensor. Make sure that you have good plugs, wires, cap and rotor. My next mod will be an electric fan which will free up some power and hopefully improve gas mileage a bit. Some people also claim that a cold air intake and a throttle body spacer also helps, but I have not tried it yet.
03-17-2009 06:43 AM
jpoutlaw down hill both ways!
03-17-2009 04:18 AM
spanky
Quote:
Originally Posted by jrrfig View Post
would dif/smaller tires help?


dont ever say that again !
03-17-2009 03:35 AM
rrich Only go down hill.
03-16-2009 09:27 PM
jpdocdave ya, i've never heard of anyone getting that mileage, accept for trying very hard on the highway to get that. i can do it on the highway. city, no way
03-16-2009 09:13 PM
stevens243
Quote:
Originally Posted by 600RRJeep250F View Post
holy crap man, i have a manual with 31's on it and i just got 20 mpg this weekend.
Are those 31 inch tires the stock size tire on your TJ? If not, did you change the speedo gear?

I ask because 20 MPG is pretty much on the far end of the rainbow for TJ's and I can't get anything close to that number.
03-16-2009 08:50 PM
600RRJeep250F holy crap man, i have a manual with 31's on it and i just got 20 mpg this weekend.
03-16-2009 08:47 PM
Bugboy Sorry if this was already posted, i didnt have time to read the entire set of posts but (once again my results are based on a cherokee) i installed an MSD 6al ignition in my cherokee 4.0 the reason is that i had it laying around from my drag car and thought what the hell. anyway It imediately improved the power and fuel economy. my cherokee was 4.0 with 5 speed running 33s with stock gearing so the foot was down all the time due to the lack of original power to it. It increased the power alot and increased my mpg by 6. You can find them on craigslist often for about $125 or buy them new for $185-250 depending on where you go. SUmmit also has their own retagged version they sell new for $175. it is a 6al also. i would advise it if it is indeed available for your engine. not sure your ignition on that. but worse case you can always resell it for more as they are always in demand. Just an idea to think about.

Sean
03-16-2009 08:08 PM
jpoutlaw
Quote:
Originally Posted by Giancarlo View Post
jeeps mpg go down with the top and doors off
Untrue with my Jeep.
03-15-2009 09:07 PM
Giancarlo
Quote:
I do get better w/o my top and doors. If you need more, good luck.
jeeps mpg go down with the top and doors off
03-15-2009 09:03 PM
birdhunter I have a 94 I6 and get great gas milage
and couldnt be happyier but Im
totally stock and my last 4x4
was a full size heavy 1/2 with a 350
it got around 10 so getting high teens is great
03-15-2009 09:01 PM
Sb5551 If I bought a smart car I would want to drive my jeep everyday lol.
03-15-2009 08:57 PM
saras we bought a smart car for mileage---average 45;;;;;; and we have the jeep for fun;;;; all in all life averages out ..don't drive the jeep as an everyday driver leave it for the fun times''''' every thing has it's purpose
03-15-2009 08:35 PM
jpoutlaw I get 17 if I take it easy. Normal driving goes to 14ish.
03-15-2009 08:22 PM
Sb5551 I have 80 miles at half tank.
03-15-2009 08:21 PM
daanbc I wish I could get 13, I'm getting 12 now. But I only had it for a week. I filled it up, the needle is a tick above half a tank now, and I have 125 miles on it.
03-15-2009 08:15 PM
Sb5551 What is this gas mileage you speak off? I average about 170 miles to a tank.
03-15-2009 08:13 PM
Barrie If I get 14 I'm happy as hell.
03-15-2009 07:46 PM
catITguy ya no offense bud, but it seems if you 'need' at least 3 more (up to 16) you may be in the wrong vehicle. Jeeps are great fun, but you have to realize going into it that gas mileage is not a jeeps strongpoint - they are geared for low end torque and are as previously mentioned, not even close to aerodynamic.
03-15-2009 07:21 PM
q8jeeper buy a prius hehehehe
03-15-2009 07:15 PM
MoA
Quote:
Originally Posted by jrrfig View Post
moa,
was there anything u had done to your jeep?
or was it all stock?
all stock..

i run both a hard and soft top.. some people say hard tops get better gas mileage but i think the added weight takes away from any aerodynamic difference it would make..

i tried keeping my rpms under 2250 when driving.. what dave said, you have to learn where your jeep likes to run at.. flooring it all the time eats your gas.. take it slow and you will notice a big difference..

i even ran wider 31s.. i had 31x10.5s..

if you dont plan on ever really plan on taking your jeep through deep mud holes or out in very sandy areas.. you could always look into a cold air intake.. im not sure how much of a difference they make but ive heard from many people they give you an extra mpg or 2
03-15-2009 07:13 PM
jrrfig aighty. thanks guys for your help! if anyone has more tips, keep em coming!
03-15-2009 07:11 PM
jrrfig moa,
was there anything u had done to your jeep?
or was it all stock?
03-15-2009 07:10 PM
jpoutlaw Walk? Bicycle? Hitch?

I do get better w/o my top and doors. If you need more, good luck.
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