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Topic Review (Newest First)
05-07-2013 07:07 PM
JeepCO12 Table with average math completed for reduction in mpg (right column)
05-07-2013 06:42 PM
JeepCO12
Quote:
Originally Posted by JeepCO12 View Post
I have searched and read numerous posts about mpg but most posts did not answer the question of how many mpg were actually lost with a given lift / wheel combo. Most posts simply stated something like I'm getting 14 mpg with 35s and a 3" lift. This does not help because some threads reveal that dfferent drivers get different mpgs even on bone stock rigs (because of driving mostly in traffic, mostly at the speed limit, pushing the brick like aero regularly on a highway commute at 70 mph or having a lead foot when leaving lights etc).

What would be useful is how much did you get with your stock Jeep vs how much you got after a lift. Then, assuming the driving style remained about the same, we would know that x lift with x wheels is likely to cause a loss of x mpg.

I already know I didn't buy a Prius (so please forget those comments). I am trying to decide whether to go with lightweight aluminum bumpers and no lift or do a modest 2" lift, heavier steel bumpers and eventually move to 33s. Since it looks like I am doing > 15,000 miles a year, gas mileage is part of the equation and I would like to know what I'm getting into. I'm getting 20-21 mpg in a stock 2012 Rubicon with manual trans. If I were to modify the Jeep so it only got 14 mpg I would be pretty unhappy.

So - if you feel like helping me (and others following) learn, please post your original stock mpg, your lift and wheel/tire size and your mpg since so we have a before and after from the same driver. Many thanks!
Well - some folks felt obliged to make those Prius and other like remarks despite my plea in the OP. It would have been OK if there had been something original in there but the same sorry comments turned up in all my searches on this subject Oy vey.

Those of you like me looking for useful info - here is a summary of the most helpful posts. You can get more detail by going back and reading the posts themselves (people posted about gears and interim mods etc) - the post numbers are in the column on the left. I would have edited post number 1 with this table so you could use it to navigate past the bogus stuff but that option has expired so sorry you had to read this far. Thanks to everyone who provided some useful data!
05-01-2013 05:57 PM
fastNugly
Quote:
Originally Posted by mpjdrizzt View Post
The light bar is obviously visible, but it's not an obstruction to your view. Coupled with the LEDs on the A-pillars, it's a pretty ridiculous combo
Im sure it is pretty ridiculous lighting....
05-01-2013 10:38 AM
mpjdrizzt
Light'em up!

Quote:
Originally Posted by fastNugly View Post
Love it!
Does that LED bar in front of the wind shield block you view?
The light bar is obviously visible, but it's not an obstruction to your view. Coupled with the LEDs on the A-pillars, it's a pretty ridiculous combo
04-30-2013 01:18 AM
JeepCO12
Quote:
Originally Posted by R8DRIZD View Post
It also depends on how you are going to use your jeep..If you dont plan on climbing hills, rock etc. you can go with light weight bumper and small tires and get 18+ mileage. If you plan on 33's+ and plan on rock or hill climbing, I would suggest placing as much weight on the front end as possible to keep the front end from popping up.

If you use your jeep like me..gas mileage is not even considered.
I had not thought about weight on the front bumper for climbing. (aware of it but hadn't thought about it in this context). The other side of the coin is highway driving, coming down over obstacles and braking. Heavy weight on the nose induces more understeer and will cause more diving without stiffer suspension.

I have not completed my first year of owning this 2012 Rubicon and we have over 15,000 miles on it. While we have been on some trails and been on slick rock in Moab, most of those miles are not offroad. So, I take your point - it does depend what we use the vehicle for. And part of the equation is what impact do bigger wheels, tires and lift have on mpg. It's only part of the decision making - but it's why I started asking. I could do more highway miles in our other vehicle and make the Jeep more off road worthy (I like lifted Jeeps with 35s) - but it might be smarter to leave some of the narlier obstacles alone and build a vehicle that will take me on the mining trails in CO, get me out if the odd jam and still get good gas mileage. So looking for others:

Jeep model year
BEFORE mods mpg
Wheels/tire size / lift
AFTER mods mpg

Thanks....
04-30-2013 12:18 AM
gsn
Quote:
Originally Posted by fastNugly View Post
Love it!
Does that LED bar in front of the wind shield block you view?
Thats the secret as to why his mpg remained the same. Dat light bar is pure aerodynamic power
04-30-2013 12:08 AM
R8DRIZD
Quote:
Originally Posted by JeepCO12 View Post
I have searched and read numerous posts about mpg but most posts did not answer the question of how many mpg were actually lost with a given lift / wheel combo. Most posts simply stated something like I'm getting 14 mpg with 35s and a 3" lift. This does not help because some threads reveal that dfferent drivers get different mpgs even on bone stock rigs (because of driving mostly in traffic, mostly at the speed limit, pushing the brick like aero regularly on a highway commute at 70 mph or having a lead foot when leaving lights etc).

What would be useful is how much did you get with your stock Jeep vs how much you got after a lift. Then, assuming the driving style remained about the same, we would know that x lift with x wheels is likely to cause a loss of x mpg.

I already know I didn't buy a Prius (so please forget those comments). I am trying to decide whether to go with lightweight aluminum bumpers and no lift or do a modest 2" lift, heavier steel bumpers and eventually move to 33s. Since it looks like I am doing > 15,000 miles a year, gas mileage is part of the equation and I would like to know what I'm getting into. I'm getting 20-21 mpg in a stock 2012 Rubicon with manual trans. If I were to modify the Jeep so it only got 14 mpg I would be pretty unhappy.

So - if you feel like helping me (and others following) learn, please post your original stock mpg, your lift and wheel/tire size and your mpg since so we have a before and after from the same driver. Many thanks!
It also depends on how you are going to use your jeep..If you dont plan on climbing hills, rock etc. you can go with light weight bumper and small tires and get 18+ mileage. If you plan on 33's+ and plan on rock or hill climbing, I would suggest placing as much weight on the front end as possible to keep the front end from popping up.

If you use your jeep like me..gas mileage is not even considered.
04-29-2013 09:25 PM
Hawaii 5-0 2009 JKU Rubicon 4.10 gears

Stock 32s with hardtop and White Knuckle rock sliders 16 to 18mpg.

33s with 2.5 inch lift 14 to 15 mpg.
04-29-2013 08:54 PM
fastNugly
Quote:
Originally Posted by mpjdrizzt View Post
I have more if you click on my avatar and check out my pics, but here's one before I pulled the hard top.
Attachment 242911
Love it!
Does that LED bar in front of the wind shield block you view?
04-29-2013 08:31 PM
mpjdrizzt
Pics

Quote:
Originally Posted by fastNugly View Post
Ahh...got it!
Do you have pics of your current JK and if so, got a link to it
I have more if you click on my avatar and check out my pics, but here's one before I pulled the hard top.
Attachment 242911
04-29-2013 08:01 PM
fastNugly
Quote:
Originally Posted by mpjdrizzt View Post
That's a question that I've been tossing around in my head Initially I'm going to try with the 3.73s. But, eventually I'll probably change to 4.56 and remedy my open differentials with a limited slip in the rear and a locker up front Unfortunately, doing things on a budget precludes my doing all mods at one time
Ahh...got it!
Do you have pics of your current JK and if so, got a link to it
04-29-2013 06:07 PM
mpjdrizzt
Gears???

Quote:
Originally Posted by fastNugly View Post
Great feedback!
Will you re gear as well when you do the 35's?
That's a question that I've been tossing around in my head Initially I'm going to try with the 3.73s. But, eventually I'll probably change to 4.56 and remedy my open differentials with a limited slip in the rear and a locker up front Unfortunately, doing things on a budget precludes my doing all mods at one time
04-29-2013 06:05 PM
fastNugly
Quote:
Originally Posted by pooneej View Post
2012 JKU 6speed Sahara 3.73s
before - 18mpg average with mixed driving (mostly city)

35" nitto trail grapps on 17x9s with a 3.5" RK max travel lift
after - 16mpg average mixed driving
This is damn good for what you have!
16 MPG on the above is amazing and this is with 3.73 gears
04-29-2013 05:21 PM
JeepHerz 2012 Sport. 3.21s
Stock- 21 MPG. Once or twice.
New Tires 305/70/17- around 18 MPG.
New Gears/4.56s, bumper armor skids etc.- 15-16 MPG freeway. (17 If I can drive 65- which I can't). Around 13-14 MPG city. Worthy every penny I lose at the pump.
04-29-2013 04:45 PM
pooneej
Quote:
Originally Posted by JeepCO12 View Post
Bump for more data - looking for

Jeep model year
BEFORE mods mpg
Wheels/tire size / lift
AFTER mods mpg

2012 JKU 6speed Sahara 3.73s
before - 18mpg average with mixed driving (mostly city)

35" nitto trail grapps on 17x9s with a 3.5" RK max travel lift
after - 16mpg average mixed driving
04-29-2013 02:12 PM
fastNugly
Quote:
Originally Posted by Sgt93 View Post
I hear lifted Prius' still get 35+ MPG.......
Hahahaha!
04-29-2013 02:02 PM
Sgt93 I hear lifted Prius' still get 35+ MPG.......
04-29-2013 12:40 PM
jyp
Quote:
Originally Posted by fastNugly View Post

Yea, this is VERY odd and would freak me out as well.....
Are you heavy on the pedal? Stuck in traffic? idling quite often?
Not really, never, and occasionally but not so significantly.

What i can say is that its been consistent for over a year. My checklist of things to have verified includes the O2 sensor, fuel injectors, air mass meter. Air filter is new. Had my used oil analyzed and no overt signs of engine wear. If i find out what's wrong I'll be sure to post what I've learned here.
04-29-2013 11:00 AM
ahsumtoy
Mileage

Quote:
Originally Posted by JeepCO12 View Post
Bump for more data - looking for

Jeep model year
BEFORE mods mpg
Wheels/tire size / lift
AFTER mods mpg
2013 JKU Oscar Mike Edition - came with 285's (32") & 3.73 gears
Stock Mileage without any lift - hwy 19.2, City 18
2" Lift - no difference
305/65/R17 Mud Tires - hwy 18.2, City 16.8
Cold Intake AEM system - don't notice any change
04-29-2013 10:54 AM
fastNugly
Quote:
Originally Posted by mpjdrizzt View Post
JKU Sahara 6spd with 3.73 and stock 32" rubber. Prior to any mods I was averaging 20 or 21 mpg. Note: I do not drive it like I stole it! As you can see from my signature below, I've definitely added a little extra weight. I'm still running the stock 32" tires and I've experienced no appreciable change in my fuel mileage as I'm still averaging 20 and yes I do the math (the computer is a little generous in its' calculations). My long term goal is 35's by summer of 2014 at which time I have no doubt my numbers will change.
Great feedback!
Will you re gear as well when you do the 35's?
04-29-2013 10:21 AM
mpjdrizzt
No change in mpg...yet...

JKU Sahara 6spd with 3.73 and stock 32" rubber. Prior to any mods I was averaging 20 or 21 mpg. Note: I do not drive it like I stole it! As you can see from my signature below, I've definitely added a little extra weight. I'm still running the stock 32" tires and I've experienced no appreciable change in my fuel mileage as I'm still averaging 20 and yes I do the math (the computer is a little generous in its' calculations). My long term goal is 35's by summer of 2014 at which time I have no doubt my numbers will change.
04-29-2013 09:36 AM
fastNugly
Quote:
Originally Posted by jyp View Post
Hmmm 2008 JKUR 6spd bone stock. Can't figure out why I'm getting 12.5 mpg on average (counted at the pump and on the odo... Real numbers). Want to lift and tires but scared it'll grind down to a standstill.
Yea, this is VERY odd and would freak me out as well.....
Are you heavy on the pedal? Stuck in traffic? idling quite often?
04-29-2013 09:35 AM
Dam yankee dont fell bad i get 8 mpg
04-29-2013 09:25 AM
termite
Quote:
Originally Posted by JeepCO12 View Post
Bump for more data - looking for

Jeep model year
BEFORE mods mpg
Wheels/tire size / lift
AFTER mods mpg

2012 JKU Sahara (3.73 gears)

BEFORE
17.8 mixed highway/city (no true city data) 19-20 highway depending on conditions.

After
Ace Rock Rails- Rancho 2" Sport lift- No drop in mileage
Removed air damn/cowl a couple weeks after lift- 17 mixed- 18.5 highway
Added Rampage Recovery bumper- No change.
Added LT285/70r17 Cooper ATPs, MB TKO's- 16.5 mixed - 17 highway.
04-29-2013 08:55 AM
JeepCO12 Bump for more data - looking for

Jeep model year
BEFORE mods mpg
Wheels/tire size / lift
AFTER mods mpg
04-29-2013 01:34 AM
jyp Hmmm 2008 JKUR 6spd bone stock. Can't figure out why I'm getting 12.5 mpg on average (counted at the pump and on the odo... Real numbers). Want to lift and tires but scared it'll grind down to a standstill.
04-28-2013 11:54 PM
fastNugly
Quote:
Originally Posted by Tweak View Post
3.5 in lift, 37", 3.73

16.5MPG

dat pentastar!
This is from a penstar and 3.73"
I'm going through this thought process too and have a JKUR coming in with 3.73 and I want 35's and worried about MPGs with the 3.73 gears.

But 16.5 to me is good as my Ram now get 12-13 MPG after lift and 37's. use to get 18-19 and I am re geared as well....so gearing didnt help MPG wise, but help bring back all the performance and more

I need help here to and am subscribed
04-28-2013 11:28 PM
JeepCO12 Thanks for the info so far! I'll see if I can summarize it and add it to the first post so others looking for this won't have to wade through the other stuff.

Any more? This is helpful - thanks.
04-28-2013 07:46 PM
benjamin.allen Never tried to figure out on my own cause frankly dont care but the dashboard says i average 12
04-28-2013 07:17 PM
mtbrider I get 29mpg....

















when I drive my wife's car.
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