Fuel economy and lift kits - JKowners.com : Jeep Wrangler JK Forum
 
LinkBack Thread Tools Display Modes
post #1 of 17 Old 06-06-2011, 06:38 PM Thread Starter
Wheeler
 
Simple Jumper's Avatar
 
Join Date: Dec 2010
Location: Oromocto, NB, Canada
Age: 32
Posts: 28
Feedback: 0 reviews
Fuel economy and lift kits

This is most likely a n00b question, be warned.

The time has come where my JK is begging for a lift kit. I've been putting it off for too long.
I'm thinking of a 4 inch for now. I don't mud/trail too often but when I do the trails around my area can be pretty demanding. The JK is also my daily driver.

My question is how much does fuel economy change with a 4" lift?
I'm averaging 13.5L/100km (+/- 17.4 MPG) in the summer and up to 16L/100km (14.7MPG) in winter.

I've searched the boards and found nothing, am I looking in the wrong place?

Any help is greatly appreciated!
Simple Jumper is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old 06-06-2011, 06:42 PM
JKO Addict!
 
e-jeep's Avatar
 
Join Date: Jan 2010
Location: Stuck walking up the down escalator
Posts: 5,713
Garage
Feedback: 12 reviews

There's no one right answer for this, but you'll most likely drop a couple mpgs.

My Build Thread ~
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

NE Trail Ride Thread ~
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Want Jeep Mods? Marcus Has It!! ~ River City Offroad
Adrenaline Offroad
~ Best Jeep shop in the Washington DC area!![/COLOR]
e-jeep is offline  
post #3 of 17 Old 06-06-2011, 06:44 PM
Granite Guru
 
Jimmy2x's Avatar
 
Join Date: Jul 2009
Location: Kingsley, Michigan
Age: 44
Posts: 128
Feedback: 1 reviews

There are many other questions that need to be answered first. What size tires are you going to run? Is it a manual or automatic? What gearing do you have? How heavy is your right foot? Blah Blah Blah......Sorry bro but it is a Jeep. This means poor gas mileage out of the box. Build it, wheel it, and have fun with it. Screw the gas mileage.

By the way, I am running a 3.5" RK lift (www.krawloff-road.com) with 35s on a 4 door Rubicon and get about 14.5 mpg on highway and about 13 around town.

"A government that is big enough to give you everything you want, is strong enough to take everything that you have." - Thomas Jefferson
Jimmy2x is offline  
Sponsored Links
Advertisement
 
post #4 of 17 Old 06-06-2011, 06:56 PM
JKO Addict!
 
EMG006's Avatar
 
Join Date: Nov 2009
Location: Monterey, CA
Age: 40
Posts: 3,187
Garage
Feedback: 5 reviews

It will go down! 14-16 at least, but like everyone said, lots of factors play in and how you drive period.

River City Offroad
Metal Cloak
EMG006 is offline  
post #5 of 17 Old 06-06-2011, 07:16 PM Thread Starter
Wheeler
 
Simple Jumper's Avatar
 
Join Date: Dec 2010
Location: Oromocto, NB, Canada
Age: 32
Posts: 28
Feedback: 0 reviews

Riding on stock rims with 32 or 33's right now. Auto transmission.
Might just start off with 2.5 TF w/ shocks for the time being and upgrade if I feel the necessity in the future.

Thanks for the fast input!
Simple Jumper is offline  
post #6 of 17 Old 06-06-2011, 08:02 PM
JKO Addict!
 
Join Date: Nov 2009
Location: Tracy, California
Age: 39
Posts: 3,068
Feedback: 4 reviews

2.5" TF coil lift, 37" Toyo MT, 5.13 Gears, 6speed and conservative driving nets me about 16-16.5mpg mixed........65 miles daily.

United States Army 1997-Present

When a life or death decision must be made in seconds.....the police are only a minute away.
09rubicon is offline  
post #7 of 17 Old 06-07-2011, 12:14 PM
Granite Guru
 
spookylynx's Avatar
 
Join Date: Jun 2010
Location: Vail, Colorado
Age: 45
Posts: 459
Feedback: 2 reviews

I put my lift on about 3 weeks ago, Rock Krawler 3.5 long arm and am running 37" KM2s I went from stock @17mpg to down to 16mpg on highway Not much of a loss. When the stock muffler was off I got about 18mpg which was funny. for what its worth, i have a cold air intake and drive pretty conservatively. I would defiately get a better performance muffler too, it seems to help.
spookylynx is offline  
post #8 of 17 Old 06-07-2011, 12:19 PM
Rock God
 
pluke the 2's Avatar
 
Join Date: Oct 2010
Location: Someplace in Africa
Age: 31
Posts: 1,730
Feedback: 2 reviews

i get about 11-12 mpgs on an auto w/ 35's and stock 373's as opposed to getting 15-16 bone stockers.


Cali Crew

My Youtube Channel:


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
pluke the 2 is offline  
post #9 of 17 Old 07-14-2011, 07:33 PM
Granite Guru
 
Join Date: Aug 2010
Location: Cleveland, Ohio
Age: 49
Posts: 115
Feedback: 0 reviews

I get 15-16 with 2.5" of lift on 33's with the 373, the superchips helped a lot.

2008 Unlimited, 2" Basic lift from Rusty's, JK quick disconnects,
Firestone MT 285 75 16 mounted to
Cragar Soft 8's 16x8 w/5" backspacing
ChatterBox is offline  
post #10 of 17 Old 07-14-2011, 08:38 PM
Wheeler
 
Botsy67's Avatar
 
Join Date: Jan 2011
Age: 52
Posts: 31
Feedback: 0 reviews

Great thread, great info, I am also contemplating a small lift to my new JKU... Thanks,
Botsy67 is offline  
post #11 of 17 Old 07-14-2011, 09:34 PM
Granite Guru
 
Topkicker's Avatar
 
Join Date: Jan 2010
Location: Harry Balls, IN
Age: 45
Posts: 426
Feedback: 0 reviews

2.5 lift and 33x12.5 tires. Drove all interstate from N Indiana to NE Georgia last week and averaged 16.4 MPG. 3:73's and auto. Heavy ass Rock Hard stubby front bumper and winch and about 300lbs of chit packed in the JK with me. Drove between 60 and 75 MPH. Only mods are Banks COI and Magnaflow exhaust.

"Our houses are protected by the good Lord and a gun. You might meet em both if you show up here not welcome, son" - Josh Thompson.
Topkicker is offline  
post #12 of 17 Old 07-14-2011, 09:37 PM
JKO Addict!
 
thaduke2003's Avatar
 
Join Date: Apr 2009
Location: Upstate NY (I'm back, baby! :))
Age: 35
Posts: 2,145
Feedback: 1 reviews
Send a message via Yahoo to thaduke2003

On mine, 3.5" RK lift with steel bumpers at each end and the spare inside (that alone picked up .25 MPG), with 6-speed, 35" KM2's (EAT gas!) and 4.88's, and I average 15.8 MPG. Not awful, I suppose.

On my wifey's old rig, we had the 6-speed, 3.73's, and 33" A/T's and a set of 4-door springs & shocks, and we averaged 19.7 MPG. Tried her tires on mine for a week, and I got 17.3. So tires matter big time- Mark W.

Back in a '94 YJ! Well, after I sink $$$$ into it...
thaduke2003 is offline  
post #13 of 17 Old 07-15-2011, 03:13 AM
Wheeler
 
Join Date: Mar 2009
Location: Sharpsburg, Md
Age: 39
Posts: 94
Feedback: 0 reviews
Send a message via AIM to armedsks

IMHO the biggest MPG hit i seen was from the tires. I have a 2"BB, I was runing the Bridgestone Duelers AT's(255/70/18) . I was getting 22-23 mpg on the highway. I recently upgraded to the 275/65/18 GY MTR's(much heavier tire) , Now im averaging 18.5 on the highway.

Im running 3.73's gears.

You will get a slight more drag from the lift, but the bigger the footprint the more it takes push your brick on wheels typically.
armedsks is offline  
post #14 of 17 Old 07-15-2011, 03:51 AM
Rock God
 
THIN ICE's Avatar
 
Join Date: Dec 2010
Location: Easley, SC
Age: 53
Posts: 1,052
Feedback: 8 reviews

A 3" lift on 35's I lost around 1mpg from stock

Best Two Guy's in the Buisness!
Jason at KOR
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Marcus at RCO
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jesus loves you, but everyone else thinks you're an asshole.
THIN ICE is offline  
post #15 of 17 Old 07-20-2011, 06:55 PM
Granite Guru
 
captaindean's Avatar
 
Join Date: Sep 2009
Location: Alpine Wyoming
Age: 52
Posts: 353
Feedback: 0 reviews

I have RK 3.5 and Goodyear 35" mud terrain tires and have lost about 80-100 miles to a tank of gas used to get about 400 now I am getting around 300 worth it though
captaindean is offline  
post #16 of 17 Old 07-20-2011, 07:00 PM
Wheeler
 
Mongrel's Avatar
 
Join Date: Jul 2011
Location: Jax, NC
Age: 42
Posts: 62
Feedback: 0 reviews

My lift is almost at 3" and I'm still on the stock 32's. I get 15.8 in city.
Mongrel is offline  
post #17 of 17 Old 07-20-2011, 08:15 PM
Granite Guru
 
JOHN412's Avatar
 
Join Date: Nov 2010
Location: Bangor, PA --Home Blairstown, NJ store
Age: 39
Posts: 402
Feedback: 0 reviews

I live in Pennsylvania but work in New Jersey. When I get gas in PA I get 1 Mpg better than when I get gas in NJ. This is no BullShit and I have tested it many times. So the MPG thing is nonsense.

If you lift it the MPG will go down. If you get bigger tires it will go down. If you drive hard it will go down. If you idle alot it will go down.

Do a simple search of this sight and you will see that people get anywhere from 11-17 MPG on this forum with the standard 35's or 37's that seem common and whatever gears. Its all in the other (100) things that contribute to MPG's. How and where you drive is the factor.



That being said I put 18000 miles on my Jeep in its first year. 1 MPG isnt huge but if you think its BS do the math at 3.70 a gallon and mail me a check for that amount. PM me for the address.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Last edited by JOHN412; 07-20-2011 at 08:19 PM.
JOHN412 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JKowners.com : Jeep Wrangler JK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome