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Old 06-21-2013, 08:39 PM   #31
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Honestly if the MPG matters then you're in the wrong vehicle. Sucks but thats the truth.

Lots of things would improve MPG but would cost more than the lifetime fuel savings you would get. For example, lockout hubs would get you 1-2 mpg. three or four of these 1 to 2 mpg changes would be significant but would cost more than the lifetime fuel milage change. Some of these changes will reduce offroad performance. Lockout hubs will annoy you.

I have a set of goodyear wrangler ST tires with 1000 miles on them, stock off my JK X with no TPMS sensors. You will probably get a 3 to 5 MPG difference with them. i'll totally sell em if you want em. They will reduce ofroad performance but increase on road performance.

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Old 06-21-2013, 08:50 PM   #32
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Originally Posted by live_slow View Post
Right let's say the average distance driver did that and got "40 MPG" from a beater and 17 from a Jeep.

So 2K worth of gas difference means 4-5 year to pay back
Tires oil changes during 4 years, another year's worth of gas difference

Insurance for those 4 years another years worth of gas difference,, two if you are young or can't get premium discounts on car insurance (imports have higher rates, they are stolen more often, especially honda)

You can play with the math all day, but you only beat the difference if you rack up thousands more miles than the "average" driver, get great MPG and service from your used car, and get lower than average MPG from your Jeep.

Like I said, do that math. If it works for you, it's a good deal. But on average it's a total wash.

BTW, what model Saturn is that? I've got two college kids driving $5K domestics (Ford, Buick) with V6s getting 20 mpg. I'd love to swap one out for a 40 MPG Saturn. Saturn Mileage Reports | Fuelly
You're right but. It would keep the miles off the jeep and make it last longer and make some expensive high mileage related expenses take more years before occurence.

Honestly if i had it my way i'd have a JK for a daily driver, with stock rubi type tires and a built CJ7 "beater" for serious offroading. The JK would still end up offroad on random occasions on my way home from work. You know, when you see a "road" and wonder where it goes. Indiana has a lot of county "roads" that make me curious. And it's perfectly legal to drive on a "road". Apparently indiana has a lower definition of "road" than michigan does.

This would make sense because the JK was purchased simply for the alleged reliability that you would allegedly get from driving around in a 2008 vs driving around in a 1971 jeep. I dont know about reliability but the JK is definitely a good street vehicle whereas the CJ7 can be bought a hell of a lot cheaper.

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Old 06-21-2013, 08:53 PM   #33
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Manual vs auto makes a big difference. And the year model does too. The 42rle auto trans lugs at sub 2000 rpms below 65 mph on stock tires and sucks gas and the torque converter in it sucks gas until it locks up at around 45-55 mph.. The overdrive in those transmissions is horrible. If you have a manual then stay off of the gas and you should see a drastic improvement. The #1 thing you can do on a manual is stay below 65 and your gas mileage will go up.
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Old 06-21-2013, 08:58 PM   #34
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It's an SC1 with the SOHC 100hp motor and I don't drive it like I stole it. And I figure about 20k miles each year on it. It only increased my insurance $9 a month. Liability only on it. Sure it might take a few years to offset the cost but at the same time it's 20k highway miles a year i'm not racking up on my Jeep as well. It's worth it to me.
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Old 06-21-2013, 09:48 PM   #35
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Thanks for all the good advice on how to improve my mpg guys. I will probably just get myself an old piece of crapp car to drive to work and back so I don't have to worry about mpg on my JK.
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Old 06-21-2013, 10:06 PM   #36
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Thanks for all the good advice on how to improve my mpg guys. I will probably just get myself an old piece of crapp car to drive to work and back so I don't have to worry about mpg on my JK.
If you buy another car for commuting, it might not save you money at all. Look you are going to spend $5000-10000 at least to get a decent car, then pay monthly insurance + oil change+ registration annually + gas money. If you spend all that money in jeep, it will last you to drive up to 10-15 years and enjoy jeep every single day.
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Old 06-21-2013, 10:06 PM   #37
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Originally Posted by live_slow View Post

Right let's say the average distance driver did that and got "40 MPG" from a beater and 17 from a Jeep.

So 2K worth of gas difference means 4-5 year to pay back
Tires oil changes during 4 years, another year's worth of gas difference

Insurance for those 4 years another years worth of gas difference,, two if you are young or can't get premium discounts on car insurance (imports have higher rates, they are stolen more often, especially honda)

You can play with the math all day, but you only beat the difference if you rack up thousands more miles than the "average" driver, get great MPG and service from your used car, and get lower than average MPG from your Jeep.

Like I said, do that math. If it works for you, it's a good deal. But on average it's a total wash.

BTW, what model Saturn is that? I've got two college kids driving $5K domestics (Ford, Buick) with V6s getting 20 mpg. I'd love to swap one out for a 40 MPG Saturn. Saturn Mileage Reports | Fuelly
I try to explain this to my buddies who just don't get it. One of them s a successful business owner thinks he is ahead.
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Old 06-21-2013, 10:12 PM   #38
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You guys make it sound like that beater car and never be sold again. That's why you get something older and reliable so then you can sale it later on and it's already depreciated about as much as it's going to anyways. You don't have to spend 5-10k to get something decent. You just have to do some research and shop around for a good deal.
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Old 06-21-2013, 10:18 PM   #39
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Honestly

Everyone knows our Jeeps do not get good mileage. You shouldn't have bought one if that is what you are worrying about. That said, the Jeep is more fun than any other car I have driven, including a Porsche 911S. Just my opinion.

Let's say one gets 14mpg and the other gets 18mpg. The difference in fill ups will cost you about $5 each time you fill up. Just cut back on the chesseburger once or twice a month. That'll pay for the difference.
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Old 06-21-2013, 10:18 PM   #40
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Originally Posted by Raiderfan001 View Post
You guys make it sound like that beater car and never be sold again. That's why you get something older and reliable so then you can sale it later on and it's already depreciated about as much as it's going to anyways. You don't have to spend 5-10k to get something decent. You just have to do some research and shop around for a good deal.
You can find a cheaper car, but maintenance of those cars is really expensive, just to change tires and and other mechanical parts once it hits over 120000 miles or so can be expensive. I ve had one of those, and i spent tons of money to keep it in drivable condition, but the car by itself cost nothing to sell.
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Old 06-21-2013, 10:24 PM   #41
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My next JK will be a manual and still be my DD, I have only owned trucks,broncos and jeeps. I hate sitting low in a car.
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Old 06-21-2013, 10:29 PM   #42
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FWIW i get 19-20mpg every tank. i also drive like my CG is the last known jeep on earth, and i'm trying to preserve it for all mankind.

additionally, until this semester is over i'll continue to do my drivint at about 90% highway. oh mud, i can't wait to get some on my tires.
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Old 06-21-2013, 10:58 PM   #43
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you dont have transmission problems with the 35s
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Old 06-21-2013, 11:13 PM   #44
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jeepjitters I have 3in lift and 35s on 18in stock rims and am having problems with the vehicle shifting in and out of o/d every 15-20 seconds. 2008 6cyl automatic
stock gears. any help appreciated
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Old 06-22-2013, 12:07 AM   #45
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jeepjitters I have 3in lift and 35s on 18in stock rims and am having problems with the vehicle shifting in and out of o/d every 15-20 seconds. 2008 6cyl automatic
stock gears. any help appreciated
Read my above post...there is a great web page to go to called grim jeeper gears. In the left column put in a dodge 42rle with a np231 transfer case and 3.23 gear ratio with 35" tires and it will show you how low the rpms drop in overdrive. There are only a couple of solutions to help you out from cheapest to most expensive.
1. Have your ecu reflashed at a dealership for your tire size (won't help much)
2. Super chip, intake and exhaust to give you nominal power (helps more and takes care of point 1)
3. Regear...then have it flashed (most effective for your $$)
4. Regear, have it flashed and put in a supercharger
5. Engine swap ( very expensive)

An engine lugging in overdrive and swapping in and out of 3rd and 4th is pretty common for your set up unless you spend a little more to regear and get it back in the power band. 5.13 or 5.38 gears will do very well for you. I would go 5.13 if you plan to push it offroad due to gear strength.
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Old 06-22-2013, 03:13 AM   #46
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I honestly think that washing the bugs off the front grill would make a bigger difference than not running the radio.


dp

You would think that, but it is not true;

Gas mileage . . . is the reciprocal of the force exerted by the engine on the car [which] can be represented by a sum of seven kinematic elements:

F = ma + (P0 +Tw)/v + mg(mcosq + sinq) + (rAf + m/x0)v2/2

The contributions are due to acceleration, auxiliary power usage such as radio, AC and headlights, transmission drag, rolling friction, hills, wind drag and stopping.

Those that charge their phone, use head lights and fog lights in the day time, play the radio loud, have the A/C on, and leave their turn signals on will notice less MPG than those who don't use all of that and just drive. Could the difference between making it to a gas station or walking 5 miles for fuel... Me I just fill up when under half a tank.

Many think the alternator is a constant and does not adjust to load/draw used causing more friction to create more power needed to electric devices.

My 2004 Mercury Marauder alternator has a clutch that disengages under wide open throttle to give more power for acceleration, same for the A/C.
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Old 06-22-2013, 04:07 AM   #47
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I think having a six speed really helps. That plus keeping everything stock, airing up the tires and driving like there's an egg under the pedal. I see some here think if you own a Jeep you shouldn't be concerned with gas mileage. If you are you shouldn't own a Jeep. I think that's bad advice.

When I had my stock 255's I was getting 24-25 on the highway @ 55 ( actual ) With my 285's aired 29 psi I'm getting anywhere between 20.6 and 22 mixed driving. I've learned to shift well at 1500 RPM and don't go over 58 mph.

Keeping all non useful stuff out of your Jeep will help, and keeping the load off the alternator does too. I removed my spare and took out the back seat ( for the room ) so you can get above average mileage if you're willing to work on it. Use top tier gas if possible. MMO ( Marvel Mystery Oil ) may give you 1-2 mpg if you don't overdose.

Here's a link I found interesting. Yes I'm concerned about how to save gas like most other folks.

100+ Hypermiling / ecodriving tips & tactics for better mpg - EcoModder.com
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Old 06-22-2013, 06:47 AM   #48
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Old 06-22-2013, 07:13 AM   #49
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I was under the impression JEEPS are to drive and have fun with. If u really want gas mileage the get a Prius.
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Old 06-22-2013, 07:16 AM   #50
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I mean that's y I'm buying mine
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Old 06-22-2013, 10:40 AM   #51
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Buy an old Honda for 2500$ and get 40+ mpg. Save miles on your jeep.
/End thread
Consider the cash used to purchase the used car, maintenace/repairs and insurance. Do the math over a few years and that money saved in fuel goes to nil and then you're also spending time in an old Honda vs your Jeep (which does depreciate even when not driven). Makes no sense to me.
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Old 06-22-2013, 11:18 AM   #52
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The savings in reality are nil, IMHO. If you already own the Jeep, your only variable cost would be fuel and an oil change or two per year. Adding a second vehicle to save on gas (splitting use 8000 miles/yr Jeep, 12,000 miles/yr Honda) isn't a huge savings IF any savings can be realized. This is a real-life example based on what a friend did only she added a $5000 Honda. She is spending a bit more than planned on a yearly avg in this cost/savings breakdown as shown and will be getting rid of her Honda due to repair costs and down time. "Savings" as follows for a (gulp) even cheaper $2500 Honda:
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Old 06-22-2013, 11:46 AM   #53
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20,000 miles driven in the Jeep:

20,000 miles/16 mpg = 1250 gallons of gas a year

using $3.50 as an average gas price i'm looking at roughly $4,375 spent on gas a year.



20,000 miles driven in the Saturn:

20,000 miles/40 mpg = 500 gallons of gas a year

using $3.50 as an average gas price i'm looking at roughly $1,750 spent on gas a year

Extra expenses so far on the Saturn? $9 a month insurance (keep in mind the premium on the Jeep is now lower with less miles driven on it in a year) and a $35 TPS. $108 + 35 + 1,750 = $1,893 spent a year in gas and insurance.

I'm not going to calculate oil changes since either one I drive would need them anyways. And the Saturn even saves me a few bucks here as well since i'm running it on regular dino oil vs synthetic in the Jeep.

4,375 - 1,893 = $2,482 saved in the first year of ownership. Hell it will have already paid for itself in less than a year. In my situation it works. You just have to do some research ahead of time. The next year after that looks like i'll have an extra $2,482 to spend on Jeep mods...
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Old 06-22-2013, 12:56 PM   #54
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I had no idea some of you Jeepers have 20k a year on a private/ non expense vehicle.

I hope you can deduct miles.

Here are averages.

http://www.fhwa.dot.gov/ohim/onh00/bar8.htm

Do whatever works. I cut my miles back below 10k average a year back around 03 and it has worked out really well.
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Old 06-22-2013, 03:12 PM   #55
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20,000 miles driven in the Jeep:

20,000 miles/16 mpg = 1250 gallons of gas a year

using $3.50 as an average gas price i'm looking at roughly $4,375 spent on gas a year.

20,000 miles driven in the Saturn:

20,000 miles/40 mpg = 500 gallons of gas a year

4,375 - 1,893 = $2,482 saved in the first year of ownership. Hell it will have already paid for itself in less than a year. :
So you've bought the Jeep to park in the garafe and mod while you spend all your driving time in a (reliable?) POS. OK if that works for you.
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Old 06-22-2013, 03:17 PM   #56
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So you've bought the Jeep to park in the garafe and mod while you spend all your driving time in a (reliable?) POS. OK if that works for you.
Driving to work...I use the Jeep to actually go offroad. I suppose if you're a mall crawler then driving your modded up Jeep from parking lot to parking lot is the cool thing to do.
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Old 06-22-2013, 05:55 PM   #57
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I was under the impression JEEPS are to drive and have fun with. If u really want gas mileage the get a Prius.
Priuses actually are not an economical choice whatsoever. Look at the environmental damage from manufacturing the batteries, disposing of the batteries, cost of batteries. and the fact that geo metros got better gas milage.
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Old 06-22-2013, 07:35 PM   #58
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Ok find one of them
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Old 06-22-2013, 07:52 PM   #59
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I think there are generally two camps: Jeep strictly a fun secondary trail vehicle, an Jeep as daily driver and occasional fun vehicle.

Given that, it's the daily driven Jeep owner concerned about maximizing MPG. Nothing wrong with that. My point is it is saves you squat to buy a Jeep as a daily, then freak about MPG by adding a second car. The math doesn't add up well.

In the example above where the Jeep is just a trail rig and a Saturn is the DD, the difference didn't net the Jeep miles and looks like it just sits putting on zero miles....I use a lot more gas on a trail so subtract that from the net.

If one drops $20-30k on a Jeep, heck, DRIVE it. ENJOY it on AND off road. MPG is not that big is not that big a deal where adding a 2nd car makes up for it. Maybe a bumper sticker: "I drive this POS because I have a nice Jeep...really!" ?
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Old 06-22-2013, 07:57 PM   #60
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I agree. I drive from NC to NJ once a month to work and then 40 miles round trip to where I stay in an avalanche now . And when my JKU comes in then that.

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