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Old 10-18-2011, 05:02 PM   #1
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Gas Mileage

Hey guys,

So I am LOVING my jeep ...but not so much on the gas mileage lol...Is there anything that I can do to help with the gas mileage. I did put a K n N air filter on which I know that it dosent do a whole lot but it did help a little bit. But is there anything else that could help?

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Old 10-18-2011, 05:14 PM   #2
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Drive slower, both on the highway and from a stop (accelerate easier off the line). If you're going 60 or even 65 versus 70, you're going to see a difference. The difference between 60 & 70 is about 2 mpg for me.

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Old 10-18-2011, 05:14 PM   #3
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Originally Posted by muddprincess17 View Post
Hey guys,

So I am LOVING my jeep ...but not so much on the gas mileage lol...Is there anything that I can do to help with the gas mileage. I did put a K n N air filter on which I know that it dosent do a whole lot but it did help a little bit. But is there anything else that could help?
I improved my gas mileage, by 15/20% and power/performance/throttle response--

If you have an on-road jeep, the K&N filter is OK, if it's an off-road jeep--discard the K&N filter and REGEAR--

The ratio will depend on your jeep use and auto/manual tranny !

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Old 10-18-2011, 05:17 PM   #4
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Originally Posted by muddprincess17 View Post
Hey guys,

So I am LOVING my jeep ...but not so much on the gas mileage lol...Is there anything that I can do to help with the gas mileage. I did put a K n N air filter on which I know that it dosent do a whole lot but it did help a little bit. But is there anything else that could help?
Unfortunatelly, our JKs are not known for their great gas millage. For that matter, none of them are I guess. It seems to be the cross we bear for driving the greatest off-road vehicle made. You have helped the front end with a K&N to help it breath better - a less restrictive exhaust may help the other end adding possibly 1 MPG, but I believe that is about the most you will see. Course, lots of folks will claim they are getting much more MPG but I don't believe them. I have a 1-ton dually chevy and there are some that claim they get 20 MPG with the same truck. It just ain't so.
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Old 10-18-2011, 05:20 PM   #5
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Quote:
Originally Posted by JIMBOX View Post
I don't love my jeep, I love my wife--




I improved my gas mileage, by 15/20% and power/performance/throttle response--

If you have an on-road jeep, the K&N filter is OK, if it's an off-road jeep--discard the K&N filter and REGEAR--

The ratio will depend on your jeep use and auto/manual tranny !

JIMBO
What did you do to get 15-20 % increase Jimbo? At 18 MPG that is over a 2 MPG increase. I could use some of that
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Old 10-18-2011, 05:23 PM   #6
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Auto/man?

Know your diff ratio?

If I'm easy with my 6 speed 16/17 tops city driving.

Just installed a intake. 1 tank of gas and not seeing a difference in MPG.
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Old 10-18-2011, 05:28 PM   #7
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I went from 4.10 diff. gears to 5.38s !!


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What did you do to get 15-20 % increase Jimbo? At 18 MPG that is over a 2 MPG increase. I could use some of that
Of course I don't get that mileage now, I only gotit when I was trying for mileage figures--on-road and off-road-

Went from 15mpg (70mph) to 17mpg(70mph) hiwy and from 13mpg off-road 4hi to 14 mpg off-road 4hi AVERAGE-

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Old 10-18-2011, 06:57 PM   #8
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I'm over 20mpg now on my daily commute of about half city and half parkway with lights that catch me here and there. I try to keep it in eco as much as possible and I have a scangauge 2 hooked into it to give me real time mpg feedback. Today's trip home was 22.5mpg!! but the tank average so far is 20.5. I'm very happy with what I'm seeing so far with this vehicle.
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Old 10-18-2011, 07:10 PM   #9
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I have a 1-ton dually chevy and there are some that claim they get 20 MPG with the same truck. It just ain't so.
mine wasnt a 1ton, but it was the 6.6 duramax, and i got 20-22 all day long. i did have a straight piped exhaust, which helped out drastically.

and my jk gets 17.5 average. about 1/2 hwy 1/2 street
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Old 10-18-2011, 11:06 PM   #10
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I'm averaging just under 19mpg in my 2010, that is city, hwy, forest roads, and going from 4300' to 9800'. I don't drive over 65, never in that big of a hurry, and I don't pull away like a dragster from the stop lights. Worst tank so far was 16.5mpg which included almost 120 miles of mountain forest roads, some 4lo, but mostly 2wd, best was 22.3 which was mostly hwy, had close to 300 miles on that tank before fill up. I'm sure when I do some real rock crawling that worst tank number is going to nose dive. Jeep is mostly stock, just a new bumper and winch.
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Old 10-19-2011, 07:30 AM   #11
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Old 10-19-2011, 07:31 AM   #12
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Old 10-19-2011, 09:01 AM   #13
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I've got almost 1100 miles on my 2011 and I'm getting in the low 18's with about 60% city/40% highway driving. To second the comments in "3.8 Driving for Dummies" don't accelerate too quickly from a start and if possible don't exceed 65 on the highway. I seem to notice that it takes considerably more foot in the pedal to maintain 70+ as opposed to 65. The Jeep's aerodynamics are not designed for slipping easily through the air at speed. As mentioned earlier numerically higher gears would probably help, but you would never recover that cost in fuel savings.
Also, using the ECO function and observing it seems to help improve fuel economy. Bottom line, you probably didn't buy your Jeep for fuel economy. Do the best you can and enjoy it!
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Old 10-19-2011, 09:14 AM   #14
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Now it's all relative-


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I've got almost 1100 miles on my 2011 and I'm getting in the low 18's with about 60% city/40% highway driving. To second the comments in "3.8 Driving for Dummies" don't accelerate too quickly from a start and if possible don't exceed 65 on the highway. I seem to notice that it takes considerably more foot in the pedal to maintain 70+ as opposed to 65. The Jeep's aerodynamics are not designed for slipping easily through the air at speed. As mentioned earlier numerically higher gears would probably help, but you would never recover that cost in fuel savings.
Also, using the ECO function and observing it seems to help improve fuel economy. Bottom line, you probably didn't buy your Jeep for fuel economy. Do the best you can and enjoy it!
Although I don't drive normally on the freeway, I did for a month while breaking in new gears (5.38) and checking temperatures and MILEAGE-

By going to a better gear ratio for the 3.8L AUTO-I increased my gas mileage, at all speeds up to 70, thats as high as I checked and my mileage increase was an average 15% BETTER, than with my 4,10 gears--

So the changing of the diff. ratios to a (higher numerical) ratio is not a gas mileage LOSER-it depends on how courageous you are-

As mentioned--you must want the gear change for different reasons, cause the cost is substancial !

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Old 10-19-2011, 09:21 AM   #15
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I always suggest cutting up a refridgerator box, shaping it like a big arrowhead and duct taping it to the front of the jeep. hehe...
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Old 10-19-2011, 09:36 AM   #16
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That was a really good post....and that is exactly how I drive my Libby which has 3.73's, the 3.7, and the 42RLE.
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Old 10-19-2011, 09:40 AM   #17
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I remember that suggestion-but-


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I always suggest cutting up a refridgerator box, shaping it like a big arrowhead and duct taping it to the front of the jeep. hehe...
You never said to ---UNPLUGIT---

Now, thanks to you (or me), I've gotta buy my wife a new frig-

Forums are dangerous-

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Old 10-19-2011, 10:00 AM   #18
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If there is any unnecessary weight in your vehicle, getting rid of it can help too. When I got my TJ it consistently saw 17-18 mpg stock. Now 4 years later with synthetics in engine, transmission, transfercase, diffs, performance headers back to performance exhaust, cold air intake, high voltage coil, throttle body spacer, etc... and heavy duty bumpers, light bar, 1" body lift, larger tires. I see 13-14 driving normally, 65-70 on the highway. If i never go over 60 and baby it I can almost see 15.

Best way to improve your milage: stay stock (unless you re-gear) and drive like a little old lady...
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Old 10-19-2011, 10:15 AM   #19
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Quote:
Originally Posted by muddprincess17 View Post
Hey guys,

So I am LOVING my jeep ...but not so much on the gas mileage lol...Is there anything that I can do to help with the gas mileage. I did put a K n N air filter on which I know that it dosent do a whole lot but it did help a little bit. But is there anything else that could help?
you could always lower it and put on 20s with street tires...more aerodynamic
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Old 10-19-2011, 04:00 PM   #20
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Hey guys it's her boyfriend again. I know there's specifics that play into gas mileage, so here's some details to help give a better idea of the truck.



* 09 Wrangler Unlimited X with hardtop.
* Auto tranny, haven't looked at the diff to see what gearing it is. Assume stock X gearing for now. (3.88?)
* 3" Lift which rides on 33's, Mickey Thompsons. I know this is a huge part. I don't think the speedo was calibrated at the dealer, but we'll fix that.
* Has a Rock Armor basket up top, along with light bar. Trying not to remove it, as the exoskeleton is one unit.

As far as upgrades relating to gas mileage, my future plans include:

* Dry filter air intake. Not much dusty offroading, only beach and mountain usage, and minor at that with our schedules right meow.
* Magnaflow exhaust to get a little more free flow, and a nicer sound.
* Throttle body spacer- worth it?
* Regear- expensive but a viable option.

Also, within the next couple weeks, my buddy is lending us his DiabloSport Predator. He's had good results with it, and it'll calibrate our speedo. Anyone else have experience with them and a similar setup? Again, thanks for all your help!

-Joe
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Old 10-19-2011, 05:48 PM   #21
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after the last fillup I limited my auto transmission to only go to 4th gear for the entire tank, my mileage increased by 2MPG, this tells me my gear ratio needs changed. 2012 with 4.10 and auto trans

try it and see if it helps and check your air pressure too
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Old 10-20-2011, 11:18 PM   #22
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Anybody? Mostly concerned with the DiabloSport tune...
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Old 10-21-2011, 12:07 AM   #23
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Quote:
Originally Posted by muddprincess17 View Post
Hey guys,

So I am LOVING my jeep ...but not so much on the gas mileage lol...Is there anything that I can do to help with the gas mileage. I did put a K n N air filter on which I know that it dosent do a whole lot but it did help a little bit. But is there anything else that could help?
Remember that any money you spend on doodads to increase gas mileage could have been used to buy gas. A regear for a 3.8/auto JK does wonders for get-up-n-go, and it can even improve gas mileage. However don't do it only to pickup 1-2mpg. $1500 can buy a lot of gas even at $3.50 a gallon.

Best thing to do is change your driving techniques. Hybrid drivers use a technique called 'hypermiling' to get as much out of a tank of gas as possible. Some suggestions are outlandish, some even dangerous, but overall should give you lots of good suggestions on how to drive to save gas.

Here is one link I've found and there are many, many others that give hypermiling tips:

Hypermiling Techniques | Hypermiling

One example: UPS creates routes for their drivers that uses as many right turns as possible. Right on red, constant greens, green arrows, all mean the truck can go instead of sitting and idling waiting on a left turn signal or waiting for a break in the oncoming traffic to turn.

UPS figures they save three million gallons of gas a year just by creating right-hand turn routes for their drivers.
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Old 10-21-2011, 03:53 AM   #24
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'07 with 3.21's and BFG K/M's 32" @ 35psi... Superchips tuned to 93 performance and running 93 octane. Shift around 2500 rpm's. Cruise control @ 68 on highway. Keep cruising RPM's in the 2k range and I'm getting 19mpg avg per tank. Last off-road excursion (6+ hours in 4-LO), rocks, river crossing and waiting my turn in line with 18 other jeeps... 14mpg.

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