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Old 10-28-2009, 08:43 AM   #1
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I need to improve gas mileage

I drive an 04 Rubicon with a 6.5 lift 4:88 gears and 37 BFG km2 automatic tranny, Warn winch, Body Armor tire carrier with 2( 5 gal gas carriers.)

Around town I'm getting 13 mpg. The jeep has become my daily driver
and I'm trying to find a way to improve gas mileage.

Should i drop down to 4;56 gears and smaller tires?
Woudl appreciate some suggestions.


thanks
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Old 10-28-2009, 09:03 AM   #2
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I didnt take the time to do the math, but the cost of gears and installation would probably take you a few years to make up the difference in gas.. just my 2 cents

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Old 10-28-2009, 09:06 AM   #3
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ya thats the problem with mpg mods... they cost more than they save

unless you put on hundreds of miles every day, its pointless
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I got a TJ 99 with 4 wheel drive sittin out back of the jail
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Old 10-28-2009, 09:08 AM   #4
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Drop weight (the Jeep), drop tire size, wear light soled shoes. No need to haul around 10 gallons of extra gas on a daily driver. It's really that simple and don't expect amazing results since you're still pulling around a transfer case, front drive shaft, skid plates, etc, etc, and you've still got the aerodynamics of a tool shed.
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Old 10-28-2009, 09:17 AM   #5
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trade your jeep for my corolla - it gets 30mpg+ in combined driving.

Seriously though, not alot you can do to improve mpg in a jeep.....if you went all the way back to basically stock you might gain a couple mpg. Most of the mods to save mpgs either dont work at all, or work but are just slightly more than negligible and would take about 340yrs to pay for themselves.
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Old 10-28-2009, 10:03 AM   #6
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On another note..my jeep came with a sub box behind the back seat and i removed it along with the back seat and i haven't checked the mileage but my baby hauls ass now!
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Old 10-28-2009, 10:42 AM   #7
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Actually your gear size is to small for your tire size if you go 5.13's on the auto it will most likely go back to normal right about 15. There is a guy up here that ran 38's and 5.13s and got 15-16. Just got to remember that it is not a race in the truck and keep your foot out of it.
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Old 10-28-2009, 10:59 AM   #8
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Don't want to be a downer here but I don't see a cost effetive way to do much for your mileage...the more you go back to stock the more your mileage will improve but the cost will be ridiculous and you will loose "your Jeep" in the process. Plus the gain will only be a couple of mpg at best (stock - around town I get 14-15mpg)...so it is just a loosing proposition IMHO.
Just go easy on the gas pedal and keep the speed down.
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Old 10-28-2009, 11:02 AM   #9
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13 is pretty dam good for running 37's.
I agree drop the gas can weight off the bumper.
Also agree that you should be running the 5.13 with the 37's & auto.
If you drop back down to 35's with the 4.88s that will help some, but dont expect alot

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Old 10-28-2009, 11:12 AM   #10
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I agree, 13 mpg is excellent for 37" tires, I only sometimes get that with my 35" tires. By the time you spent the significant $$$ for new smaller tires or regeared, it'd take many years to recoupe the costs from the very small mpg improvement you would get
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Old 10-28-2009, 11:22 AM   #11
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I agree, 13 mpg is excellent for 37" tires, I only sometimes get that with my 35" tires. By the time you spent the significant $$$ for new smaller tires or regeared, it'd take many years to recoupe the costs from the very small mpg improvement you would get
I don't agree. This is only true if you throw your existing tires and wheels and gears in the trash. Why not downsize and sell the parts you take off to recoup some cost then you won't be that far out of pocket and it will take a shorter amount of time to get your money back with your better gas millage. I am a newb at this jeep scene but it is not rocket science.
Sorry Jerry I see you know far more than me but when you upgrade you sell (if possible) your old parts to make the upgrade more cost effective. If so then why does that not work as good or better in reverse. I customize sport class jetski's and I know that if I wanted to start going back towards stock specs there are a ton of guys that would buy my upgrades.
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Old 10-28-2009, 11:26 AM   #12
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Here's some suggestions. you probably won't like them. and the gains will be minimal. But I'd love to see someone do these things.

Lose weight (you and the jeep) , slap a big (light weight) aerodynamic nose cone on the front (think superbird.) Go easy on the "go" pedal.

lower it to stock height (or lower), stock tires, but not as wide.

Engine swap (something along the lines of a turbo 4 cyl - stay out of the boost).

or go buy a beater Honda Civic, toyota corolla, Nissan Sentra.
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Old 10-28-2009, 11:30 AM   #13
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Yea for the selling parts say he sells the diff stuff (gears and pinion) he would only make 75 bucks on used gears. I mean it would not be really saving anything. The jeep would go back to bein just a jeep not the RIG
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Isn't the JK just a rebodied PT Cruiser?!

Quote:
Originally Posted by coyote_94yj
Just a few more inches Red. You can take it.


If you haven't gotten more out of the insurance company than you deserve, then you haven't screwed them nearly as much as they have been screwing you for the past xx years.
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Old 10-28-2009, 11:36 AM   #14
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I don't agree. This is only true if you throw your existing tires and wheels and gears in the trash. Why not downsize and sell the parts you take off to recoup some cost then you won't be that far out of pocket and it will take a shorter amount of time to get your money back with your better gas millage. I am a newb at this jeep scene but it is not rocket science.
Sorry Jerry I see you know far more than me but when you upgrade you sell (if possible) your old parts to make the upgrade more cost effective. If so then why does that not work as good or better in reverse. I customize sport class jetski's and I know that if I wanted to start going back towards stock specs there are a ton of guys that would buy my upgrades.
He couldn't sell his old gears & tires for enough to make a significant dent in the cost of new tires & installing new gears. We're not talking PWCs where impellers, ride plates, etc. (I was into that sport for years) can be swapped around at reasonable costs.
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Old 10-28-2009, 11:38 AM   #15
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Yea for the selling parts say he sells the diff stuff (gears and pinion) he would only make 75 bucks on used gears. I mean it would not be really saving anything. The jeep would go back to bein just a jeep not the RIG
Leave my jeep out of it, Mods don't come cheap.
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Old 10-28-2009, 11:45 AM   #16
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This is about the only cost effective way I know to mod a Jeep for better gas mileage:
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Old 10-28-2009, 11:48 AM   #17
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Old 10-28-2009, 11:49 AM   #18
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^^^ Yeah, but my bike was at least a Jeep, not a heap!
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Old 10-28-2009, 11:51 AM   #19
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^^^ Yeah, but my bike was at least a Jeep, not a heap!
But look at the lift I have.
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Old 10-28-2009, 11:53 AM   #20
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Yeah you can remove stuff for free like doors, back seat, your gas cans and your winch.
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Old 10-28-2009, 11:55 AM   #21
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actualy removing the doors wil probably cause more drag

and removing all the winch and gas cans and whatnot will get you a mpg if your lucky

leave it as it

I would suggest a programmer if anything
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I got a TJ 99 with 4 wheel drive sittin out back of the jail
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Old 10-28-2009, 11:56 AM   #22
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A 1 MPG increase would save you about 150$ a year IFF you drive 12,000 miles a year at about 2.50$ a gallon. That number can be doubled, tripled, etc if you increase MPG.
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Old 10-28-2009, 12:20 PM   #23
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Annual gas costs at $2.50 per gallon, assuming 12,000 miles per year:
13 MPG: $2307 (my CJ*)
14 mpg: $2143 (my CJ if I modified for mpg)
18 mpg: 1,666 (my WJ)
35 mpg: $857 (my Honda Civic)

Guess what I drive to work. There are advantages to a Wrangler. Sitting in traffic ain't one. When I commute, I love the quiet, the cupholders, the automatic, the radio controls on the steering wheel, the iPod plug, blah blah blag.

*Actually, I've never measured the MPG in the CJ. It's for the same reason my cousin won't step on a scale: way too scary to think about.
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Old 10-28-2009, 12:22 PM   #24
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But how does it flex? What's your RMI?
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Old 10-28-2009, 01:35 PM   #25
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does that have VTEC? must be the new honda vtec 1 mule power model
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I got a TJ 99 with 4 wheel drive sittin out back of the jail
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Old 10-28-2009, 02:14 PM   #26
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must be the new honda vtec 1 mule power model
If you ever visit a farm and try to put shoes on a "donkey", please promise to take pictures.
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Old 10-28-2009, 05:28 PM   #27
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But how does it flex? What's your RMI?
Look who's pulling it.
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Old 10-28-2009, 07:15 PM   #28
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ok so here's my take on the situation.
loose weight go to aluminum wheels if your on steelies, go to AT tread tires if your MT's, drop down to 35's since your on 37's, or regear to accommodate the 37's

or think about it like this.

if you go buy some cheap aluminum wheels and 35" AT tires your still going to spend 1000-1500 bux and you would be lucky gain 2-3mpg TOPS.
or you could go find a cheap GOOD used car in the 2-3 grand range or maybe a touch more and get 25-30mpg and yea you will be spending and extra 100 a month on a car payment
but the money you save in gas every week would easily pay for the car payment and insurance.

2 years ago when gas prices were outrageous my mom was driving her 05 F250 powerstroke diesel as her DD. it got 15-16 mpg tops and her commute was 150 miles A DAY round trip.
$4.50 a gallon 26 gallons every 3 days adds up real quick. she was spending on average about $800-1000 a month on diesel fuel ALONE. I gave her my 96 S10 to drive for a while which cut her fuel costs in half but that still gives her a $500 gas bill. not long after that she bought a used 99 mazda protege wth just under 100k miles on it for 3 grand and has since put over 30k miles on it and the only money she has put in it is a sway bar endlink, new tires, and oil changes. the car runs great and gets 35mpg.

she still has to buy gas about every 3-4 days but instead of filling up a 30 gallon tank on a rig that gets 15 mpg shes filling up a 12 gallon tank. she still loves driving her truck when she can but she is happier than a pig in slop to have the car to drive everyday.
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Old 10-28-2009, 11:22 PM   #29
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Try running synthetic oil in the engine and diff's, that might get you 2-3 mpg's. This will especially help if you live in a colder part of the country heading into winter.
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Old 10-28-2009, 11:32 PM   #30
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Lose weight (you and the jeep) , slap a big (light weight) aerodynamic nose cone on the front (think superbird.)
Oh man... I you have no idea how hilarious that is given the photoshopped picture rolling around this forum.

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