i have a 95 wrangler yj and i get really bad gas milage. i have a 2.5l
4cy. so i was expecting to get ok milage with this. i just got a tune
up and i am switching tires from super swampers to all terains. im
putting on a new air filter. is there aything other things that would
help me out. i have heard mixed reviews on the tornado thing that goes
in your air filter that is supposed to give you more hp and better mpg.
any sugestions at all will be appreiciated.

thanks
chris

The only suggestions I have are to pay attention to the weather and try
to catch tail winds and to get lighter shoes....

Because of the power to weight ratio, the Jeep 4 banger gets about the
same mileage as the 6 gets. These engines are pretty tweaked stock.

Forget gimmicks and snake oil.

I have heard of some folks getting or doing a bored out throttle body to
use with headers but whether the power change is perception due to the
nicer sound or real is open to debate.

I would recommend you post over on rec.autos.makers.jeep+willys where
folks have these and try to tweak them.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

chris wrote:

On 22 Nov 2006 07:56:27 -0800, "chris" <bmarley630 (AT) yahoo (DOT) com> wrote:

What mileage are you getting? What kind of driving? How old/agressive
are you?

On Wed, 22 Nov 2006 11:25:26 -0500, Mike Romain <romainm (AT) sympatico (DOT) ca>
wrote:

Do you own one?? I'll bet not, I do in a 2000 Cherokee. Again you talk
about things you know nothing about.

The biggest problem a Wrangler has with the 2.5 AMC motor is drag
because it has the areo dynamics of a brick. Even with a 6 MPG can
suck at times. Tires play a big roll too. When you have bigger tires
you make effect drive ratio taller and the tires add more drag and MPG
will take a dump from them both combined. If MPG is your real goal
here, you want to keep tire size as stock as possible or regear Jeep
if they are bigger to keep engine in power range. Keep a fairly smooth
tread too as knobby tread consumes more power and cruise at 60 or less
to keep drag down. Running tires near max pressure will help also.
With my wifes Cherokee, she gets around 20 to low 20's in urban
driving to work with some city traffic. In winter it drops to high
teens on same route. On a trip up to get my daughters in college or to
vist them it gets about 23 to 25 MPG depending on how much you push
it. It has gotten as high as 27 since we bought it new on a long trip.
If you want to spend a bit of coin you could swap in a AX15 in place
of your AX5 because it has a taller OD (.78 vs .84) and it is a
sturdier tranny too (came with 6 cylinder) After 2000 Jeep started
using NV3550's with sixes and it has a slightly taller OD yet. To
swap tranny you need the bellhousing out of a 96 to 98 Dakota because
it used same engine as Jeep then when equipped with a 4 banger and the
same clutch slave setup to to make switch easier. This bellhousing
will make it possible to use a AX15, NV3550 or even a HD HV4500 (you
want the NV3550 over a NV3500 if you got that route because the 3550
was made as a bolt in replacement for AX15) 89 octane helps too as my
wifes Jeep picks up one or two MPG when using it and runs smoother
too.
-----------------
TheSnoMan.com

You are trying to say in this post that a Dodge Dakota uses the 'AMC' 4
banger?

LOL!

I won't even bother to address the rest of your fantasy.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

SnoMan wrote:

PeterD wrote:
i am getting about 12mpg right now. when i first got my jeep i was
doing a lot of offroading and i have superswampers on right now. i know
those tires are made for mud and are killing the mpg. i am 21 years old
now and i have tried to be less agressive on the road to try to keep my
jeep running as long as possible. i have also stoped offroading as much
i will only go maybe once every few months. i just bought a/t's so i
know the new tires will help. i just would like to get a little better
milage with the way gas is right now. people tell me to get a new car
but there is now way in hell i would ever sell my jeep lol

chris wrote:

That is extremely poor mileage. You should be up in the 20's on the
highway.

Even my old CJ7 with it's 258 and 33" tires gets a nice 23 mpg highway.
I have a t-case speedo gear change so the speedometer and odometer are
right on according to various GPS's and a 'measured "mile"'. (we have
km's up here instead of miles now, but my Jeep is in miles still)

What size are the tires? Oversized tires put the speedometer out so the
'perceived' gas mileage isn't the 'actual' gas mileage.

Oversized tires also blow the top gear's power band. Top gear is called
overdrive and with my 33's, it puts the engine rpm too low at 65 mph.
(1750 rpm) This causes the engine to lug when a slope or headwind hits,
which just drinks gas. If I use 5th, I lose at least 5 mpg or more. If
I forget about 5th and only use 4th for a top gear, it keeps the engine
in the rpm band it likes for mileage and power.

That would be worth a try.

Just a note. I found the mph difference at about 65 mph between 31's
and 33's to be about 6 or 7 mph with the same between 31's and the stock
29" tires. That means 33's could be about 15 mph off at 65 mph or close
to 24%.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

On Thu, 23 Nov 2006 10:52:57 -0500, Mike Romain <romainm (AT) sympatico (DOT) ca>
wrote:

Yes they did from 96 to 98 when equipped with a 4cyl but then you
would know that too "IF" you knew half of what you claim you do. You
do not have a prayer of a chance with outdoing me on Jeep hardware
because I have messed with them for almost 30 years now. (especailly
the ones that were still real Jeeps not this hybrids they make today
that are becoming more Dodge than Jeep with each passing year. (AMC
did far more to keep a Jeep a Jeep than Chysler ever did or will do.)
The Jeep briefly used the Pontiac 2.5 (also called GM Iron Duke) in CJ
from 80 to 83 but not after that and the AMC 2.5 with came out in 84
in Cherokee is based on a old AMC 232 with 2 cylinders lopped of and
yes again Dodge did use them for a few years in the dakota but not the
Jeep tranny as they used a NV3500 instead of a AX5 or AX15. This trick
with Dakota bellhousing is well known to hard core Jeep guys that
tinlker around and the reason you want those years and model is
because it also used the same slave cylinder setup as the Jeep so no
changes are need there in swap.
-----------------
TheSnoMan.com

On Thu, 23 Nov 2006 11:54:11 -0500, Mike Romain <romainm (AT) sympatico (DOT) ca>
wrote:

Why do you tell him when you realy are kinda clueless? How many have
you owned???? CJ/Wranglers are never great MPG wise unless you drive
slow or with a tail wind and have smooth tires. Knobby tires can
realy hurt MPG on a 4 banger jeep, especailly oversized ones.
-----------------
TheSnoMan.com

You will get the best gas mileage possible by running the least number
of rpm's per mile. This is usually as slow as you can go and still be
in high gear. You get better mileage by flooring it and staying in high
gear up a hill than by downshifting. This is not intuitive, but needs
to be understood. A lot of us say, well gee, the car RUNS better at
higher rpm. That's true, but it gets worse gas milage. It feels like it
runs better because at higher rpms you have more torque and it
acclerates better.

Other than that, I dunno. It used to be you could lean your carburetor
and some other things, but you can't do any of that anymore as
everything is computer controlled fuel injection. You could get someone
to put an analyzer on your port and see if any error codes show up.
Also get a tailpipe inspection to make sure you aren't running rich for
some reason.

You guys keep changing your tire size and wonder why your gear ratios
are screwed up. Well, the gears are made for the tire size that comes
with the car, duh!!! Change the tire size and it's NOT going to be
ideal anymore. Have fun trying to re engineer your gear ratios to match
your new tire size. Its not a trivial task.

Jeep Wranglers don't get good mileage. My 4Runner is heavier than a
Jeep Wrangler and has more horsepower and gets better gas mileage than
a Wrangler. Not sure why that is, but I doubt you can tune the Wrangler
to match it. Maybe there is some chip change that can give you a little
more HP, I dunno.