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Unread 08-20-2011, 04:13 AM   #1
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1991 YJ Wrangler 
Join Date: Apr 2011
Location: Orlando, FL
Posts: 148
2.5 / 4.0 which its better in fuel economy?

hi i just want to know if there's a big difference between the 2.5 and the 4.0 fuel economy?thank for all your help.

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Unread 08-20-2011, 05:59 AM   #2
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1993 YJ Wrangler 
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Location: Daphne, Alabama
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Not really. If MPG is an issue; forget it. Pushing a vehicle through the wind with the aerodynamic characteristics of a brick is a loosing proposition.
A Rancher told me that back home he can drive his Jeep all day and not get off his own property; I said "I've got a Jeep like that too"!

"Nothing sucks more than that moment during an argument when you realize you're wrong" (Paul :-̃)
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Unread 08-20-2011, 06:26 AM   #3
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1998 ZJ 
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Location: Northern, New Hampshire
Posts: 438
I've had both engines, the 4cyl was a little bit better but not enough to make it a deciding factor. These vehicles are not fuel efficient for sure! That being said, I was getting 12 MPG in my F150 and I'm doing around 14 or 15 in the Jeep with the 4.0 and 33's
-2013 JKU Sport, bone stock, Auto with 3.73's
-1998 ZJ Laredo, 4.0 42RE Selec-Track, 30" M/T tires
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Unread 08-20-2011, 06:55 AM   #4
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1995 YJ Wrangler 
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Location: Keene, NH
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20mpg repeatably with the 2.5, 4.88s and 33s. The trick is to drive 55mph. If I go to 65mph I drop to 17mpg.

And on a long highway trip, 55 vs 65 really makes a difference in your arrival time!
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Unread 08-20-2011, 07:02 AM   #5
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1991 YJ Wrangler 
Join Date: Dec 2010
Location: 14304 Niagara Falls, NY
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I average 17 MPG with a healthy 2.5 my buddies with 4.0 average 15 This is for mixed city/highway with occasional light trails in the summer and hell snow up to your butt in the winter. I've gone as high as 20 MPG with only highway driving, but city driving just absolutely kills the MPG's. I might as well be driving a bus in the city, that's how bad it kills it. I'm running the stock 4.10 gears with 31x10.5 tires.
But really I hope you have a *lot* of money for gas because no matter what a Jeep is going to eat it

Last edited by oldtime_ironman; 08-20-2011 at 07:07 AM.. Reason: relevant details
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Unread 08-20-2011, 07:06 AM   #6
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1996 XJ Cherokee 
Join Date: Oct 2007
Location: Eastside Indy
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i've had both, and both got about the same fuel economy for me. i read somewhere on here about how the increased power of the 4.0 offsets the decreased fuel consumption of the 2.5, so it ends up being a wash. so if it's a decision between the two, i'd recommend going the 4.0 route. after struggling behind the 2.5, i feel like i can tow the world with it
1996 XJ Country, 4.0, aw-4, 2wd :(
Previous rides:
1995 XJ SE, 2.5, ax-5, 231, cancerous unibod...traded^
1995 XJ Country, 4.0, aw-4, 231, babysat for brother...
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Unread 08-20-2011, 12:42 PM   #7
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1995 YJ Wrangler 
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Location: daleville, AL
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I get 18mpg city driving with my 4 cylinder. I rarely do extended highway driving, but when I have I hit 20 mpg's. That is at 55 to 60 mph.
To me, RC is kind of the Harbor Freight of springs. Sometimes you get a good deal and sometimes you don't.
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