MPG with larger tires?

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Jun 11, 2012 | 12:06 PM

#16

BuckB91XJ

CF Veteran

Joined: Nov 2008

Posts: 6,989

Likes: 4

From: Oak Harbor, WA.

Year: 1987

Model: Cherokee

Engine: 4.0 liter RENIX I-6, DIY Cold Air Intake, 2.5 FM Exhaust, 3 Core Radiator

Quote:

Originally Posted by MISFITXJ

ive gone thru everything no leaks new injectors filter most of the sensors got a cold air damn t body spacer banks t tube header???????? ive always thought theres somethin wrong but i cant find it?????

Tom,

I have a couple questions that I think may point out a possible problem with your mileage.

1.) How many miles does yuor jeep have on it?
2.) Have you done a compression check on it and does it have good compression in all cylinders?
3.) Do you have an auto or manual tranny? Well either way you could have a slipping converter or clutch if it has high miles on it.
4.) what RPM to you see when at hwy speed say 70mph? You could have a bad tranny servo and it may not be going into OD. or it could just be straight slipping and running the engine at higher rpm causing the bad mileage.

Jun 13, 2012 | 05:23 PM

#17

buggutz

Thread Starter

Newbie

Joined: Jun 2012

Posts: 2

Likes: 0

Model: Cherokee

Thanks all for the info... greatly appreciated!

I think I would like to go with 33" tires with the 4.56 gearing.
Anyone have any MPG ratings for this scenario on a Jeep WJ with automatic???
Sounds from what I am reading I can expect a little bit of drop from the stock MPG as long as I do the gearing change.