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Old 03-06-2014, 11:01 PM   #1
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SERIOUS mpg ideas

I UNDERSTAND I DRIVE A JEEP AND ITS CONSUMES A LARGE AMOUNT OF GAS! That still doesn't change the fact that I'm a student who can log between 225-325 miles a week due to current family situations and a girlfriend that lives 40 miles away. If anyone has any type of mod or ideas please let me know. I am planning on buying a new muffler and from what I heard I will gain some horse power.

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Old 03-06-2014, 11:04 PM   #2
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The only thing that will really make a difference is your driving style. That and gearing/tire size.

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Old 03-06-2014, 11:06 PM   #3
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I baby her and I get about 15/15.5 mpg compared to I believe the 13 that kbb says
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Old 03-06-2014, 11:16 PM   #4
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sell the jeep and buy a kia
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Old 03-06-2014, 11:20 PM   #5
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I get the same and am almost similar situation with miles per week. idk if this is true but maybe making it lighter would help. although there are other factors when doing that. i have the spare tire off mine mainly because i dont have a jack that will fit. but maybe if back seat and spare tire came off it shave maybe 100 lbs or so. be an interesting experiment to see. obviously tire size as mentioned before by deepsouthjeeper would be another reason maybe swap out the meaty tires for something..."daintier"
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Old 03-06-2014, 11:31 PM   #6
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This question has been asked a lot

Let me google that for you
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Old 03-07-2014, 12:07 AM   #7
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sell the jeep and buy a kia
I would never I love the thing. Plus it's not American so sorry not driving it...
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Old 03-07-2014, 01:11 AM   #8
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I baby her and I get about 15/15.5 mpg compared to I believe the 13 that kbb says
15.5 sounds about right, assuming 3.07/3.73 and 31 in or so tires. Instead of picking up a Kia, how about a small dual sport dirt bike? A 250 would probably get 70 or so mpg, and would be good for short trips, plus it's a lot more fun than any economy box you'll find out there.
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Old 03-07-2014, 07:00 AM   #9
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Sell your jeep and buy an economical car. When you finish college buy another jeep.

I had to get rid of my cj7 in college, which made me feel that life was over. Since graduation I have purchased 4 different wranglers and two chevelles.

My point is to do the smart thing now so that you are in a better position to buy toys in a few years.
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Old 03-07-2014, 07:04 AM   #10
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Sell your jeep and buy an economical car. When you finish college buy another jeep.

I had to get rid of my cj7 in college, which made me feel that life was over. Since graduation I have purchased 4 different wranglers and two chevelles.

My point is to do the smart thing now so that you are in a better position to buy toys in a few years.
This is great advise!
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Old 03-07-2014, 07:16 AM   #11
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I got 14.5 in my '99, my '06 currently gets 12.5, and there's nothing left to look at but o2 sensors now. A muffler by itself won't add horsepower worth mentioning but if you put the sticker on your window it will double. Have you considered dumping the girlfriend?
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Old 03-07-2014, 07:24 AM   #12
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Even though it defeats the purpose of a Jeep you could take off the front driveshaft until you're ready to use it off road. One less thing to rotate and it saves weight.
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Old 03-07-2014, 11:45 AM   #13
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A muffler by itself won't add horsepower worth mentioning but if you put the sticker on your window it will double. Have you considered dumping the girlfriend?
This is awesome advise
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Old 03-07-2014, 12:00 PM   #14
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Quote:
Originally Posted by Big Cole View Post
Sell your jeep and buy an economical car. When you finish college buy another jeep.

I had to get rid of my cj7 in college, which made me feel that life was over. Since graduation I have purchased 4 different wranglers and two chevelles.

My point is to do the smart thing now so that you are in a better position to buy toys in a few years.
What I was getting at.
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Old 03-07-2014, 12:17 PM   #15
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Girlfriend and jeep aren't going anywhere in the near future. How about replacing o2 sensors
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Old 03-07-2014, 12:25 PM   #16
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dude you atre getting the right gas mileage... nothing is going to magically make it get better.

the only other thing is to get gas without ethanol in it.
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Old 03-07-2014, 12:31 PM   #17
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Quote:
Originally Posted by Big Cole View Post
Sell your jeep and buy an economical car. When you finish college buy another jeep.

I had to get rid of my cj7 in college, which made me feel that life was over. Since graduation I have purchased 4 different wranglers and two chevelles.

My point is to do the smart thing now so that you are in a better position to buy toys in a few years.
great advice
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Old 03-07-2014, 12:37 PM   #18
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I average 12.5-13mpg with a 5-10 mile daily commute (depends if I go home for lunch). I didn't even consider (seriously) a Jeep when I was a student or when I was commuting 75 miles a day for work or when I had a wife and two kids to transport. Have always wanted one but wasn't in the right place in life till a couple years ago. Sometimes you gotta do what you gotta do until you get in the right situation. Either suck it up and live with the poor mpg or get a small car to run you back and forth until you can suck it up and live with the poor mpg.
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Old 03-07-2014, 12:40 PM   #19
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Get a better paying job is the only thing I can think of. Lol I'm a delivery driver....with a jeep. I get 12-14 on the job. But between minimum wage and tips it makes it a lot less painful. I'm also a full time student and physique competitor. Just easy on the skinny pedal, that's all there really is.


Then again I have seen a couple of RX8s out there that wanna trade me...
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Old 03-07-2014, 12:40 PM   #20
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Quote:
Originally Posted by Big Cole View Post
Sell your jeep and buy an economical car. When you finish college buy another jeep.

I had to get rid of my cj7 in college, which made me feel that life was over. Since graduation I have purchased 4 different wranglers and two chevelles.

My point is to do the smart thing now so that you are in a better position to buy toys in a few years.
I would agree, But the truck has sentimental value to me. That's why I put up with the gas mileage. I mean the more power you have the less gas needed to do the same amount of work, am I wrong? I'm just trying to be efficient with my gas and money, not trying to pull a rabbit out of a hat.
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Old 03-07-2014, 12:43 PM   #21
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Old 03-07-2014, 12:52 PM   #22
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Nicylaxer, what gear ratio, tire size and tranny are you running? I learned this accidentally but it has helped on both of my TJs. I have a 2000 with 3.07 gears, 3 speed auto and 33s. We also have a 97 with 3.55 gears, 5 speed manual and 32s. Both are 4.0 6 cyls. Take the elbow off the stock air filter box if still equipped and change the air filter if it needs it. Just a stock replacement will be ok. Next, open up your spark gap to .048" instead of the .035 recommended. If it needs plugs, again, now is a good time. I like Autolite single platinum, just stay away for the exotic plugs. These 2 items combined got us about 1 mpg better on both jeeps cruising. The 97 gets high 19s to 20 cruising. Mine got in the high 17s to mid 19s cruising but has dropped about 1.5 mpg when I went from 32s to 33s. And as posted above, driving style, gear ratio and tire size will affect your mileage. Good Luck.
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Old 03-07-2014, 01:00 PM   #23
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and a tornado
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Old 03-07-2014, 01:06 PM   #24
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Nicylaxer, what gear ratio, tire size and tranny are you running? I learned this accidentally but it has helped on both of my TJs. I have a 2000 with 3.07 gears, 3 speed auto and 33s. We also have a 97 with 3.55 gears, 5 speed manual and 32s. Both are 4.0 6 cyls. Take the elbow off the stock air filter box if still equipped and change the air filter if it needs it. Just a stock replacement will be ok. Next, open up your spark gap to .048" instead of the .035 recommended. If it needs plugs, again, now is a good time. I like Autolite single platinum, just stay away for the exotic plugs. These 2 items combined got us about 1 mpg better on both jeeps cruising. The 97 gets high 19s to 20 cruising. Mine got in the high 17s to mid 19s cruising but has dropped about 1.5 mpg when I went from 32s to 33s. And as posted above, driving style, gear ratio and tire size will affect your mileage. Good Luck.
I have 31s on an auto 4.0 with either 3.02 or 3.73 (I can measure after school)
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Old 03-07-2014, 01:37 PM   #25
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If you wanted to think outside the box you could consider something like a conversion to propane or natural gas fuel. You would need a new tank, and a regulator, but your fuel injection system should be plug and play. Propane is around $2/gal here. Efficiency isn't as good as with gas, so your mileage will actually go down but you'd still be ahead on money.

Or for even more savings an engine swap to a TDI. Of course that's a spendy outlay initially but with a few tweaks, killer torque and 30+mpg on diesel, which you could always switch to cooking oil, salvage from restaurants, and run for free.

Or...smaller tires, change gear ratio, lighter wheels, and changing your driving habits.
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Old 03-07-2014, 01:40 PM   #26
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Just a thought for Nickylaxer. Depending on the tires you are running you could possibly try and few more LBS of tire pressure? This is more of a question for the group here but a little less resistance might not hurt. I didn't catch what year/motor, etc he was running either. I guess the problem is the Jeep is nothing more than a shoe box on wheels. Warmer weather might help also if he's using the defroster more during the winter this means A/C is running too which usually pulls a little more power away from the engine.
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Old 03-07-2014, 01:45 PM   #27
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Make sure you always run the proper tire pressure. You have to adjust for season changes twice a year plus if you leak any. Tire pressure goes a long way towards optimal MPG. Less parasitic loss of power in the drivetrain will help as well. Make sure the tranny is fully tuned and tight. Lots of loss there. Also synthetic fluids with friction fighters will help prevent loss in the tcase and axles.

Before people jump on the bandwagon about this, I am looking at the accumulative effects for improved MPG. Clean air filter is cheap, change it often. Cold air intakes don't really add up to much other than a thinner wallet. Leave the horn in the air box. It reaches up higher towards cooler air behind the headlight. Take off the trim rings around the lights and vent the engine compartment for cooler air coming into the factory air box.

You could also try indexing your plugs for optimal combustion.




Lots of things to do. Minimal increase at best for all of them. It is a flying brick. Sounds like your are about maxed out on the MPGs anyway. Maybe another 1-2, but not much.
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Old 03-07-2014, 03:59 PM   #28
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Nothing you add to a 4.0 will do anything, it will not even marginally improve anything. All it will do is lighten your wallet.
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Old 03-07-2014, 04:27 PM   #29
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Old 03-07-2014, 04:51 PM   #30
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Aerodynamics on a Jeep are awful, there's not much you can do to improve the coefficient of drag. Power required to overcome drag increases rapidly as speed increases. So, drive slower, you will use less fuel...

Tire pressure. For wheeling, you want to lower it to better grip rough terrain. But, low pressure increases rolling resistance. Set your tire pressure at the max on the sidewall of your tire (not the recommended pressure in your manual).

Drive in the highest gear possible at the lowest RPM without lugging.

Do you have a smartphone? Buy a Bluetooth OBDII reader and get the Torque app. If not, buy an Ultragauge. Both connect to your OBDII port and tell you things your normal instruments do not. Instant and average MPG, for example. Seeing MPG real-time can help you figure out the best methods for improving fuel economy. Even if you don't care about fuel economy these are nice to have.

If you are real serious, you could look into diesel swaps. I suspect you'd be looking at a different car before going this route though.

So far, I'm averaging 19.8mpg in my '98 4cyl in mixed driving (half highway, half stop-n-go/city). Would probably do better if I pumped up the tires and borrowed the Ultragauge from my commuter.

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