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Topic Review (Newest First)
12-23-2011 06:39 AM
bheiser I get about 16 mpg
12-23-2011 05:11 AM
SirGeorgeKillian Our Jeeps get respectable mileage on the open road. It is the stop and go that kills us. I averaged a solid 20 on the interstate on a trip that had me stopping only for gas, and setting the cruise at 55 for hours on end uninterupted.
12-23-2011 05:06 AM
vbTJeeper Awesome. Thanks man!
12-22-2011 03:56 PM
miketx
Quote:
Originally Posted by vbTJeeper View Post
My question is to those who get 16-17..Other than plugs, wires, oil and filter..what else? Distributor cap and rotor? I've been meaning to change my diff fluid. What other suggestions?

As posted, I don't go above 63 max and drive like a grandma.
When I bought my '98 with 100k miles on it, I did everything you listed above, including the cap & rotor. I noticed the engine ran smoother. I also changed out the fluids (coolant + thermostat, diffs, transfer case, transmission). I recently got about 16 mpg going 68-70mph on a trip.
12-22-2011 11:09 AM
Peepers
Quote:
Originally Posted by vbTJeeper View Post
Anyone?
Bueller...


Bueller...
12-22-2011 11:00 AM
vbTJeeper
Quote:
Originally Posted by vbTJeeper View Post
My question is to those who get 16-17..Other than plugs, wires, oil and filter..what else? Distributor cap and rotor? I've been meaning to change my diff fluid. What other suggestions?

As posted, I don't go above 63 max and drive like a grandma.
Anyone?
12-21-2011 06:46 AM
AVtj03 Direct your Air Intake towards your exhaust manifold to make it a warm air intake. You will lose power, but you will gain mpg's. The warmer the air the more prone for detonation and easier vaporization. your ecu will compensate for it by reading the IA sensor.

here it comes....
12-21-2011 03:30 AM
ejxjohnson
Quote:
Originally Posted by Wyominer View Post
I have a 06 LJ Rubicon. In straight stock, w/auto, on the hiway with A/C going, we got 22-24 mpg driving 60 - 65 mph. Put 32 inch tires on, and that knocked the mpg back to around 20 mpg. I swiched to full synthetic in the engine, but haven't changed the diff's yet. With the weather getting colder, I can feel the "drag" in the diff's before the oil gets warmed up. I have a 45 mile round trip to work, and average about 18 mpg for work.
holy hell i wish i got 22 or even 16 heck even 14 mpg.......in the summer time Im able to get about 13-14 mpg and in the winter im getting 8-10 mpg but thats because I use auto start for about 3-5 min before my 5 min drive to work and again from work to home its great living so close to where I work, but it just kills gas your gas going on so many short trips a week
12-21-2011 02:05 AM
somis im 19 and i try and 3 wheel every corner i can while pingin' my 4 banger at 3500! just kidding only when i get stuck behind you grandma drivers!
only solution to the beat the gas guzzling jeep, MAKE YOUR JEEP YOUR SECONDARY DRIVER. but always the primary vehicle in your heart
12-20-2011 10:42 PM
vbTJeeper My question is to those who get 16-17..Other than plugs, wires, oil and filter..what else? Distributor cap and rotor? I've been meaning to change my diff fluid. What other suggestions?

As posted, I don't go above 63 max and drive like a grandma.
12-20-2011 09:23 PM
Wyominer I have a 06 LJ Rubicon. In straight stock, w/auto, on the hiway with A/C going, we got 22-24 mpg driving 60 - 65 mph. Put 32 inch tires on, and that knocked the mpg back to around 20 mpg. I swiched to full synthetic in the engine, but haven't changed the diff's yet. With the weather getting colder, I can feel the "drag" in the diff's before the oil gets warmed up. I have a 45 mile round trip to work, and average about 18 mpg for work.
12-20-2011 08:28 PM
Shred802 yeah, it really is all in the way you drive, just adding more stats: 2000 sport, 30's 5 speed, if i try i can get 21 mpg going 55 mph on the interstate. also if you wheel, say good bye to mpg. i got an average of 9 mpg my last tank due to having to much fun in the mud!
12-20-2011 04:05 PM
SirGeorgeKillian Drive slower, tune up the engine, and be a natzi about tire pressure. You can google how to hyper mile, but that is about it. You are driving a 4 wheel drive vehicle with 30 year old technology, with the arodynamics of a double wide. 13 isnt bad.
12-20-2011 03:06 PM
vbTJeeper
Quote:
Originally Posted by vbTJeeper View Post
So if you do drive a stock Jeep (4.0, auto, 30" tires) and you're getting 13 mpg hwy, what would you do to it?
bump
12-19-2011 08:40 AM
arcountryboy Take your 2,000 and do a complete tune up on it, then take the rest and put it in the shop and have someone find out why it's getting below average fuel mileage, it should be getting better than that in stock form.
12-19-2011 08:33 AM
Peepers
Quote:
Originally Posted by Camacozie View Post
I'm getting an avg of 14 MPG now. If I upgrade headers, catalytic, cat-back, air intake and performance chip what do you think my MPGs could become?

My budget is around $2k. If I can get 19 MPG this upgrade could pay for itself within a year. That is IF I can get 19....
I did all that (except for the chip) and LOST 2 mpg... I also switched from a full dino oil drive system to fully synthetic, added a high voltage coil, 8mm sparkplug wires, and good spark plugs.

She deffinatly has more pep, but that just means you want to put your foot in it more.

Drive 55-60 and no more. I can pick up over 1mpg just by slowing down from 65-70 to 55-60.
12-19-2011 08:26 AM
UnlimitedLJ04
Quote:
Originally Posted by Arch Stanton View Post
how reliable the Frito truck engine will be?
cost will be pretty high by the time your done....however, Cummins 4BT's are very reliable. They're used in lots of industrial applications...think generators, backhoes, boats, etc. Generators on some job sites may run for 1000's of hrs, stopping only for oil changes. The bread truck versions just happen to look exactly like a chevy 350 front the rear (bellhousing bolt pattern, output)
12-19-2011 05:26 AM
Arch Stanton I read some of the thread: he ended up with 22 mpg. I wonder how much it cost him for the swap and how reliable the Frito truck engine will be?


Quote:
Originally Posted by SirGeorgeKillian View Post
Take your 2 grand, and go buy a Frito/Lays truck with a Cummins 4BT engine in it. Pull the engine out, pull your engine out. Sell the truck sans 4BT engine, and sell your engine. Take that money and have the Cummins put in your current Jeep.

That is about the only way you will notice any real gains...
12-18-2011 10:05 PM
UnlimitedLJ04
Quote:
Originally Posted by vbTJeeper View Post
So if you do drive a stock Jeep (4.0, auto, 30" tires) and you're getting 13 mpg hwy, what would you do to it?
sell it and buy a Honda Civic or a Toyota Prius.
12-18-2011 10:00 PM
vbTJeeper I drive ~30 miles hwy daily. I stay at 60 and have always driven 'like a grandma'. I average 220 miles on my 16 gal tank.
12-18-2011 08:53 PM
PaulRevere1991
Quote:
Originally Posted by vbTJeeper View Post
So if you do drive a stock Jeep (4.0, auto, 30" tires) and you're getting 13 mpg hwy, what would you do to it?
drive it slower, you should be getting at least 3mpg better. e-fan conversion mabye
12-18-2011 07:36 PM
vbTJeeper So if you do drive a stock Jeep (4.0, auto, 30" tires) and you're getting 13 mpg hwy, what would you do to it?
12-18-2011 05:43 PM
SirGeorgeKillian Take your 2 grand, and go buy a Frito/Lays truck with a Cummins 4BT engine in it. Pull the engine out, pull your engine out. Sell the truck sans 4BT engine, and sell your engine. Take that money and have the Cummins put in your current Jeep.

That is about the only way you will notice any real gains...
12-18-2011 03:27 PM
TJNewbie Did the OP ever say what size tires he had, or what his gear ratio is?
12-18-2011 10:37 AM
Another Guy In A Jeep
Quote:
Originally Posted by Camacozie View Post
Manual Tranny, stock everything else...
Just remember to be a smooth driver with the manual and don't accelerate to hard and bam. good to go.
12-18-2011 10:35 AM
UnlimitedLJ04
Quote:
Originally Posted by fadec View Post
What about a front hub conversion kit?

I don't have any personal experience with them, but wouldn't you think being able to unlock the hubs and have the front wheels free wheel gain some mpg? Even in 2wd the front axle, diff & drive shaft are turning. That has to create some drag. How much I don't know and the reduction in drag / minor improvement in mpg may not be worth the cost. I think the kits are around $800 - 1000.
the front hub conversion will have a very minimal impact on MPG, if at all.

how much gas can you buy for $800-1000?

Heck, for the $2000 the OP was talking about dumping into CAI's, chips and other crap you can buy a good used car that gets 30-40mpg all day long.
12-18-2011 10:27 AM
fadec What about a front hub conversion kit?

I don't have any personal experience with them, but wouldn't you think being able to unlock the hubs and have the front wheels free wheel gain some mpg? Even in 2wd the front axle, diff & drive shaft are turning. That has to create some drag. How much I don't know and the reduction in drag / minor improvement in mpg may not be worth the cost. I think the kits are around $800 - 1000.
12-17-2011 07:13 PM
Pontiackid87 Id say get a 2nd car as well.. look into a 4 cylinder fiero... you can find a nice 88 for well into what your budget for upgrading your jeep is and they get into the 40 MPG range if you get a 5 speed.. there pretty darn relibale and fun to drive.. just stay away from 84's
12-17-2011 07:03 PM
Wrangler06 get a 4 banger ;] 2.5" lift and 31s on mine and get 21 on highway trips, 17-19 in town
12-17-2011 06:51 PM
miketx Everyone has been giving you good advice. Bottomline: keep your foot out of it and speed below 65. I just drove 600 miles in mine, averaging 69-70 mph......and my mileage was 16-17....and mine is perfectly in tune and runs great.
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