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-   -   13mpg!!! can it get better???? (http://www.wranglerforum.com/f282/13mpg-can-it-get-better-27856.html)

jrrfig 03-15-2009 06:52 PM

13mpg!!! can it get better????
 
i have 31 in. bfg a/t tires, 6cyl, standard, 2door, hard top most of the time. its a 2000 tj with 90,000 on it. im getting 13 mpg and i need at least 3 more mpg! would dif/smaller tires help? or maybe putting my soft top on help?anything is i think worth doing so any ideas would be much appreciated! thanks!

orange05tj 03-15-2009 06:54 PM

http://i223.photobucket.com/albums/d...c5666f7a26.jpg

jpdocdave 03-15-2009 06:59 PM

keep it tuned up, tire pressures right, air filter clean. not much else to do, you aren't gonna get much better. my xj is 13 city, but if you keep your foot out of it, and keep the rpm's around 1950 to 2050 on the hwy you can do pretty well. i get 20 mpg on the hwy at 62 mph and 1950 rpm.

MoA 03-15-2009 07:04 PM

yah i never got below 16 mpg with my 31s on my i6 and i had 3.07 gears..

you could always swap in a 4bt cummings diesel =D

Jp90Talon 03-15-2009 07:04 PM

Quote:

Originally Posted by orange05tj (Post 339329)

See I always saw Wranglers as aerodynamic as Lunch-boxes on wheels. This was the only related pics I could come by.

http://farm4.static.flickr.com/3120/...6a784a.jpg?v=0

But one thing that I have noticed is if you keep the speed down to 55-65 on the highway the mpg isnt that bad. But the moment you go over that gas milage plunges.

jrrfig 03-15-2009 07:07 PM

i try to stay under 2000 rpms. i also have a tubular rack on top. would taking that off help with wind resistance? or maybe actual street tires?

MoA 03-15-2009 07:07 PM

before i lifted my jeep.. the sweet spot was at 65 mph.. i got about 18 mpg then.. any more or any less itd drop to about 16..

jpdocdave 03-15-2009 07:10 PM

yep, learn where the gearing and tires and your engine wanna be.

jpoutlaw 03-15-2009 07:10 PM

Walk? Bicycle? Hitch?

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

jrrfig 03-15-2009 07:11 PM

moa,
was there anything u had done to your jeep?
or was it all stock?

jrrfig 03-15-2009 07:13 PM

aighty. thanks guys for your help! if anyone has more tips, keep em coming!

MoA 03-15-2009 07:15 PM

Quote:

Originally Posted by jrrfig (Post 339351)
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

q8jeeper 03-15-2009 07:21 PM

buy a prius hehehehe

catITguy 03-15-2009 07:46 PM

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.

Barrie 03-15-2009 08:13 PM

If I get 14 I'm happy as hell. :)

Sb5551 03-15-2009 08:15 PM

What is this gas mileage you speak off? I average about 170 miles to a tank.

daanbc 03-15-2009 08:21 PM

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.

Sb5551 03-15-2009 08:22 PM

I have 80 miles at half tank.

jpoutlaw 03-15-2009 08:35 PM

I get 17 if I take it easy. Normal driving goes to 14ish.

saras 03-15-2009 08:57 PM

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

Sb5551 03-15-2009 09:01 PM

If I bought a smart car I would want to drive my jeep everyday lol.

birdhunter 03-15-2009 09:03 PM

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

Giancarlo 03-15-2009 09:07 PM

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

jpoutlaw 03-16-2009 08:08 PM

Quote:

Originally Posted by Giancarlo (Post 339457)
jeeps mpg go down with the top and doors off

Untrue with my Jeep.

Bugboy 03-16-2009 08:47 PM

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

600RRJeep250F 03-16-2009 08:50 PM

holy crap man, i have a manual with 31's on it and i just got 20 mpg this weekend.

stevens243 03-16-2009 09:13 PM

Quote:

Originally Posted by 600RRJeep250F (Post 340061)
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.

jpdocdave 03-16-2009 09:27 PM

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

rrich 03-17-2009 03:35 AM

Only go down hill.

spanky 03-17-2009 04:18 AM

Quote:

Originally Posted by jrrfig (Post 339326)
would dif/smaller tires help?

:bottom:

dont ever say that again !


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