Better gas mileage

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Jun 25, 2014 | 07:27 AM

#16

280z

Thread Starter

Newbie

Joined: Apr 2011

Posts: 9

Likes: 0

Model: Cherokee

Thanks for everyone's advice. At least I know my jeep is normal.

Jun 25, 2014 | 08:16 AM

#17

RTorrez1

CF Veteran

Joined: Sep 2011

Posts: 4,172

Likes: 4

From: Riviera, Texas

Year: 1998 Sport

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Cpeever

One thing would be DO NOT CHANGE AIR FILTER. You may think I am crazy, but any engine with a MAF sensor will get better gas mileage with a dirty filter. With a dirty filter, it increases the vacuum in your intake. With this, the fuel goes in better and mor evenly. You will actually see an mpg drop when you change it. But of course, you will still have to change it since paper falls apart.

Try putting down the crack pipe before giving any kind of advice!!!! No one in there right mind would think this is the right thing to do. DON"T GIVE ADVICE IF YOU HAVE NO IDEA WHAT YOU ARE TALKING ABOUT!!!!!

Jun 25, 2014 | 11:04 AM

#18

Cpeever

Newbie

Joined: Jun 2014

Posts: 3

Likes: 0

Model: Cherokee

Quote:

Originally Posted by RTorrez1

I have heard numerous master techs give this advice. They have also done a scientific study. Like I said, they had mpg's drop when they put in a new air filter a couple times. Not on crack, and it was proven.

Jun 25, 2014 | 11:18 AM

#19

IJM

CF Veteran

Joined: Jan 2014

Posts: 1,545

Likes: 353

From: District of Columbia

Year: 1998

Model: Cherokee (XJ)

Engine: 4.0

Quote:

Originally Posted by Cpeever

One thing would be DO NOT CHANGE AIR FILTER. You may think I am crazy, but any engine with a MAF sensor will get better gas mileage with a dirty filter. With a dirty filter, it increases the vacuum in your intake. With this, the fuel goes in better and mor evenly. You will actually see an mpg drop when you change it. But of course, you will still have to change it since paper falls apart.

Not to burst your bubble, but the throttle plate is what causes intake tract restriction and hence vacuum, unless you're driving all the time at WOT, not the air filter.

Jun 25, 2014 | 11:36 AM

#20

93gc40

CF Veteran

Joined: Mar 2009

Posts: 2,750

Likes: 3

From: Visalia, Kalifornia, ussa

Year: 1996

Model: Cherokee

Engine: 4.0

17MPG is almost exactly right at the overall factory rating. So yeah I guese you might squeeze another 2mpgs out of it and get to the top end of the 16-19 mpg factory rating.

Jun 25, 2014 | 11:37 AM

#21

rgr4475

Senior Member

Joined: Feb 2011

Posts: 897

Likes: 2

From: NJ

Year: 2004 WJ, 1998 XJ

Model: Grand Cherokee(WJ)

Engine: 4.7 HO

Quote:

Originally Posted by Cpeever

Link to the data where it was proven?

Jun 25, 2014 | 12:16 PM

#22

Pelican

Senior Member

Joined: Mar 2013

Posts: 691

Likes: 2

From: Texas

Year: 1993

Model: Cherokee

Engine: 4.0L

What is a "factory rating" as it relates to fuel mileage?

Jun 25, 2014 | 12:17 PM

#23

RTorrez1

CF Veteran

Joined: Sep 2011

Posts: 4,172

Likes: 4

From: Riviera, Texas

Year: 1998 Sport

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Cpeever

Maybe those guys are on crack then? Show us the so called "scientific study".

Jun 25, 2014 | 12:38 PM

#24

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

Quote:

Originally Posted by Cpeever

Name: 5fEifQn.jpg
Views: 35
Size: 79.9 KB

Quote:

Originally Posted by Pelican

What is a "factory rating" as it relates to fuel mileage?

http://www.fueleconomy.gov/feg/bymod...Cherokee.shtml

OP's numbers are like-new. Pretty good for a 14-year-old vehicle!

Jun 25, 2014 | 01:05 PM

#25

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

Quote:

Originally Posted by Pelican

What is a "factory rating" as it relates to fuel mileage?

'98 2WD is:

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Jun 25, 2014 | 01:57 PM

#26

SteveMongr

Beach Bum

Joined: Jul 2011

Posts: 6,123

Likes: 22

From: Cape Hatteras, North Carolina

Year: 2000 WJ

Model: Grand Cherokee

Engine: 4.0

Thanks all for the entertaining thread!

Here is how I roll..

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Last edited by SteveMongr; Jun 25, 2014 at 04:03 PM.

Jun 25, 2014 | 03:51 PM

#27

jpz

Senior Member

Joined: Jul 2013

Posts: 524

Likes: 99

From: PA

Year: 2000

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by Cpeever

Oh well ok then, it was proven; well I'm off to throw some dirt, leaves and anything else I can find into my air filter.

Improved MPGs here I come!!!

Jun 25, 2014 | 04:23 PM

#28

salad

Herp Derp Jerp

Joined: Nov 2011

Posts: 18,251

Likes: 17

From: Parham, ON

Year: 1999

Model: Cherokee

Engine: 4.0L OBD-II

Quote:

Originally Posted by SteveMongr

Thanks all for the entertaining thread!

Here is how I roll..

Pinecones should be in the cowl for that fresh scent.

Jun 26, 2014 | 02:34 AM

#29

nzoliver

Newbie

Joined: Apr 2012

Posts: 8

Likes: 0

From: Christchurch, New Zealand

Year: 2015

Model: Cherokee

Engine: 3.2l V6

Hi all!!

Well I get 13.8 average:

It runs stock tyres; 225/75 R15 and is a 98 4.0 Auto 4x4.

I wonder why?

Lots of others on Fuelly are getting low teens too

Dammit! Gas is US$1.98/ litre = US$7.92/ US gallon.

Makes for expensive running!!!!!!!!!

HELP

Last edited by nzoliver; Jun 26, 2014 at 02:37 AM.

Jun 30, 2014 | 01:48 PM

#30

xjallseasons

Senior Member

Joined: Feb 2011

Posts: 664

Likes: 29

From: Arizona

Year: 1996

Model: Cherokee

Engine: 4.0

There are more things you can do but I remember a couple more that might help. Install lockers in the axles and remove the mechanical fan and install an electrical fan. You'll only get a few mpg's more but if you have the money and want to try then go for it.

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