Upgrade tires for better mileage?

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May 19, 2011 | 08:32 PM

#16

digger21

Senior Member

Joined: Apr 2011

Posts: 858

Likes: 0

From: parker, co

Year: 1996

Model: Cherokee

Engine: 4.0 HO

I would say the better idea would be to spend the money on engine mods too. I think you could improve your gas more by exhaust, injectors,TB, etc than a tire swap.

May 19, 2011 | 10:55 PM

#17

ChileRedBateman

Member

Joined: May 2010

Posts: 182

Likes: 0

From: Concord, NH

Year: 1998

Model: Cherokee

Engine: 4.0L

Quote:

Originally Posted by askingxforxit

I'm running 235/75/15 cuz that's what came on it when I bought the xj. Right now I get about 20mpg mostly highway driving. I'm curious what increase I would get going to stock 215/75/15.

I would not go down to 215s, 235 or 225 in a street tread is where you want to be, as mentioned is it the tread pattern that catches wind, and a wider tire will do the same thing

a 235/75/r15 is 28.88" high x 9.25" wide.
a 215/75/r15 is 27.7" high x 8.46" wide.

find a 225/75/r15 street tread and go with it.

May 20, 2011 | 04:49 AM

#18

jcwclm

CF Veteran

Joined: Sep 2010

Posts: 2,844

Likes: 0

From: Warsaw, IN

Year: 2000,1990,1999

Model: Cherokee

Engine: 4.0

Quote:

Originally Posted by ChileRedBateman

May 20, 2011 | 07:03 AM

#19

razor02097

CF Veteran

Joined: Jun 2010

Posts: 2,117

Likes: 3

From: Ohio

Year: 1998

Model: Cherokee

Engine: 4.0 stock

Quote:

Originally Posted by jcwclm

To a certain extent.

Any mod to increase fuel economy would increase it "to a certain extent"

Larger tire = more mass = engine has to work harder to turn it = decrease in fuel economy.