Why dont Jeeps get better gas milage?

#1

I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

#2

On Fri, 30 Jan 2009 19:19:39 -0600, me (AT) privacy (DOT) net wrote:

Quote:

I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

put on skinny hard tires

replace body with sleeker sheet metal

replace high friction 4x4 drive line with small displacement FWD
driveline

lower car closer to ground

oh wait, you could buy a FWD Patriot ,,, and save yourself all the
trouble finding the parts to mod a CJ like this

<sorry, couldn't resist>

reboot

#3

me (AT) privacy (DOT) net wrote:

Quote:

I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

A Jeep is not a car. If you want car-like performance and gas mileage, buy a car.
Please don't sissify any Jeeps!

#4

"DougW" <I.only.read.usenet (AT) invalid (DOT) address> wrote

Quote:

me wrote from a troll saturated privacy service:

I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

Who says a CJ can't get 20+ mpg? It's all in the engine
tuning and driving style.

Old Jeeps with the Nutter Bypass routinely get better than
20 MPG and even pass California emissions for newer vehicles.

Even my ZJ gets better than 20 and it's blown.

--
-- DougW -- 93 ZJ 4.0 http://revbeergoggles.com
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

Doug,
how did you get 20+ on your CJ? I doubt I'll ever see that kind of
efficiency on my CJ-7. I have a SBC with 33" Bf Goodrich tires. I'm lucky
if I get 9MPG. Then again, it's not my commuter car, it's my fun car.

#5

No hold up at all, go for it!

I drive an 86 CJ7 with the 258 ci straight six, basically stock for
engine and tune a bunch others for my friends and we all get over 20 mpg
or 11L/100KM highway.

Stock the CJ's were rated for 21 mpg, far better than the new fuel
injected gas pigs. We wheel alongside folks with the newer TJ's and
they are always crying the blues when we use about $15.00 "less" than
they do for the same run. The new fuel injection is nice because you
don't have to tune them as often, but you pay for the convenience with
lower mileage.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '09. Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com

me (AT) privacy (DOT) net wrote:

Quote:

I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

#6

Besides what the other folks have noted, the Jeeps have the aerodynamics of
a brick.
Tomes

<me (AT) privacy (DOT) net> wrote

Quote:

I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

#7

"DougW" <I.only.read.usenet (AT) invalid (DOT) address> wrote:

Quote:

Who says a CJ can't get 20+ mpg? It's all in the engine
tuning and driving style.

ok so could they get 30 mpg?

#8

"Tomes" <ask.me (AT) here (DOT) net> wrote:

Quote:

Besides what the other folks have noted, the Jeeps have the aerodynamics of
a brick.

Cant they smooth the aerodynamics down some so that
better gas mileage would result?

I'm just proposing some small changes that could really
make them more efficient

#9

J. Clarke wrote:

Quote:

Mike Romain wrote:
No hold up at all, go for it!

I drive an 86 CJ7 with the 258 ci straight six, basically stock for
engine and tune a bunch others for my friends and we all get over 20
mpg or 11L/100KM highway.

Stock the CJ's were rated for 21 mpg, far better than the new fuel
injected gas pigs. We wheel alongside folks with the newer TJ's and
they are always crying the blues when we use about $15.00 "less"
than
they do for the same run. The new fuel injection is nice because
you
don't have to tune them as often, but you pay for the convenience
with
lower mileage.

You really think the difference is the fuel injection and that the 700
pounds more weight doesn't have anything to do with it/

Yes I do because mine gets basically the same mileage fully loaded for a
two week camping trip or bare empty, the weight doesn't seem to make a
difference.

99% of my mileage checks are running fully loaded for camping.

Now if you want to talk headwind and tailwind, there is a noticeable
difference there of a couple mpg.

Running with the front diff spinning up also costs me another couple mpg
and the TJ's have no choice on that, where the CJ's have disconnects.

Quote:

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '09. Some Canadian Bush Trip and Build
Photos: http://mikeromainjeeptrips.shutterfly.com

me (AT) privacy (DOT) net wrote:
I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?

#10

J. Clarke wrote:

Quote:

Mike Romain wrote:
J. Clarke wrote:
Mike Romain wrote:
No hold up at all, go for it!

I drive an 86 CJ7 with the 258 ci straight six, basically stock
for
engine and tune a bunch others for my friends and we all get over
20
mpg or 11L/100KM highway.

Stock the CJ's were rated for 21 mpg, far better than the new fuel
injected gas pigs. We wheel alongside folks with the newer TJ's
and
they are always crying the blues when we use about $15.00 "less"
than
they do for the same run. The new fuel injection is nice because
you
don't have to tune them as often, but you pay for the convenience
with
lower mileage.
You really think the difference is the fuel injection and that the
700 pounds more weight doesn't have anything to do with it/
Yes I do because mine gets basically the same mileage fully loaded
for a two week camping trip or bare empty, the weight doesn't seem
to
make a difference.

99% of my mileage checks are running fully loaded for camping.

Now if you want to talk headwind and tailwind, there is a noticeable
difference there of a couple mpg.

Running with the front diff spinning up also costs me another couple
mpg and the TJ's have no choice on that, where the CJ's have
disconnects.

Try the same off-road route empty and with 700 pounds of extra weight
and see what difference it makes.

Well on that one $15.00 per run difference with the TJ's, we were bush
running from base camp so we were all pretty much empty.

Quote:

If fuel injection hurt gas mileage then why would car makers in the
world of CAFE be using it?

Because you don't have to tune it to keep the mediocre mileage so the
emissions are more stable. Carburetor systems need to be kept tuned or
they pollute like crazy.

I have owned a brand new carbureted car that got 50 mpg right from the
get go.

Quote:

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
'New' frame in the works for '09. Some Canadian Bush Trip and
Build
Photos: http://mikeromainjeeptrips.shutterfly.com

me (AT) privacy (DOT) net wrote:
I would love to have a CJ Jeep but just cant go back to
sub 20 mpg efficiency

Seems to me it would be easy to make them get better
gas mileage

What is the holdup?

Advice?