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Old 01-18-2013, 11:15 AM   #31
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Ah, perhaps I should have elaborated on a few things to avoid flaming. It was really early (or late) when I posted this so I tried to just get it all out and get to sleep. I was merely listing anything that was changed on the jeep just to help everyone get a general picture of what was done to the jeep that could possibly change the gas mileage. I didn't want to leave anything else out because my thread was 80% created for the purpose of helping those out there that need to squeeze a little extra out of their jeeps.

Ill also add that the jeep needed a new header and muffler to pass MD inspection due to rust and cracks. I replaced the cat and sensors at the same time because they too had 200,000 miles on them and it just made sense to me to take care of it at the same time. Bolting together all brand new exhaust was wayyy easier.

About the cheap filter comment, I mean maybe some small particulate can get by? Won't really blow my engine though lol.

The injectors were free, came stock on my mustang.

Everything else was initial maintenance. Fluids, filters, and plugs are a no-brainer for a vehicle that I know not what the PO did with. Im an amsoil dealer so it was cost effective.

The sun visors were removed when I added a sky pod speaker box and stayed off so I could start fabricating an overhead rack to hold a cb, fire extinguisher, machete, tweeters, etc.

The braces honestly might go back on, but I was leaving them off at the time because I am still doing random crap to the engine and to ease trail repairs to the motor if god forbid something happens while I'm out.

All the porting and cleaning cost me maybe 10 bucks and a few stray hours. Girlfriend kept me fed so it wasn't too bad.

Rewiring the battery and all was done with spare wiring I had left over from battery relocations I performed on the drivable mustang and the not so drivable 69 Mach 1.

All in all the intake was the only thing I actually bought for the purpose of better MPG, the rest was maintenance or free.

Again this thread was mostly intended to be helpful, I was just listing EVERYTHING I could think of that was changed on the jeep just in case it performed voodoo magic on the MPG.

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Old 01-18-2013, 11:16 AM   #32
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People get all touchy when it comes to Jeep engine mods for some reason, ignore that.

One thing I never thought I would say.. get a throttle body spacer. One of the issues the 4.0 has is that the intake and exhaust are on the same side so the warmer the jeep gets the less efficient it gets. the throttle body spacer will add an extra inch of space away from the exhaust which may not be much but I hear it does help keep the sensors closer to honest.

I think your list looks good so far, I've done most of the same and am also wanting to move to an electric fan.

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Old 01-18-2013, 11:19 AM   #33
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I won't waste our time here any more...
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Old 01-18-2013, 11:30 AM   #34
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Originally Posted by nuclearmuscle523 View Post
All in all the intake was the only thing I actually bought for the purpose of better MPG, the rest was maintenance or free.

Again this thread was mostly intended to be helpful, I was just listing EVERYTHING I could think of that was changed on the jeep just in case it performed voodoo magic on the MPG.
When you mentioned the mustang and the use of mustang injectors I KNEW thats what was going on. Personally I say if there are inefficiencies you can fix do it, even if the change is barely noticeable. Chances are its going to give you longevity if nothing else. I did similar stuff with my old jeep which still ran smooth and strong at 240,000 miles

welcome to the forum by the way
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Old 01-18-2013, 11:32 AM   #35
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Did you notice any power change with the mustang injectors and cleaning that all up? Thats one thing I have not done.
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Old 01-18-2013, 12:03 PM   #36
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Comments getting pretty harsh. To clarify my initial comment, I don't have any problem with you spending your money however you deem appropriate. Just wanted to throw my $0.02 in that you can spend a lot of money for little return.

Best thing I did for mpg was move close to work for my new job. Drove 70-80 miles a day for 17 years. Wanted a Jeep the whole time but wasnt about to keep it in gas. Now drive about 5 miles a day. Lovin' the Jeep.
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Old 01-18-2013, 12:17 PM   #37
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Lot of time, effort, and money for negligible gains. My best mod was to start driving like an old lady. 17 mpg as if it really matters
was going to say, I haven't done any of that and got better than 18 just driving right
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Old 01-18-2013, 01:11 PM   #38
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Can always do VW TDI conversion. They see 26-30 mpg easy, and it's just damn cool I think.
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Old 01-18-2013, 02:03 PM   #39
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Don't bother removing the supports to the grill guard and sun visors weight saved like 3LB that is not saving weight. things to remove to save on weight are taking out the rear seat an and taking off the spare tire. that's like 150lb /200lb if you have a winch remove that another 100Lb at least.

Of course you could do what my friend did and just drop in a dodge 5.9L and get 24MPG. I get 20MPG with my 2.5L in Denver with 33" and 4.10
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Old 01-18-2013, 03:55 PM   #40
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So my new curiosity is: Is your '69 an R code? I'm not a mustang guy, but my dad was and I really loved that car. His was black jade. Good luck with the jeep, enjoy your toys.
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Old 01-18-2013, 05:30 PM   #41
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She is an F code GT with a 302 originally. I built a 351w to go with the Mach 1 theme and it will be a stealth restomod. Stock appearance but with hidden creature features. Anything my 23 year old brain can create I will do. That tdi swap does sound nice.
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Old 01-18-2013, 06:34 PM   #42
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Hey I was busting you earlier, but once I read your explanation you were much more clear about what you had done and why.
You can probably reread your first post and understand why some of us had fun with you.
Clearly you know what you are doing, just didn't fill us in on the details....
enjoy and good luck
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Old 01-18-2013, 06:52 PM   #43
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Originally Posted by JGreen06TJ View Post
Would be interesting to figure out how much money you've put into picking up 3 mpg and see how long it will take to recover that cost. Sounds like a lot of what you've done was required maintenance, but I wouldn't throw thousands of dollars into trying to save hundreds at the gas station.
Lmao!
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Old 01-18-2013, 07:31 PM   #44
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Clear things up a lot with your second post, sorry for being so harsh on my first.
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Old 01-18-2013, 08:20 PM   #45
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Im a nubie to owning a tj, but this I know. I knew what the mpg was when I bought it but its a jeep and I want to drive it because its a jeep and like other posts I do drive it like an old man when im tooling around town. When I showed my friends what I bought, everyone told me that they have wanted one. I will buy nothing else but wranglers. I'M ADDICTED!
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Old 01-18-2013, 09:49 PM   #46
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When I was shopping for a Wrangler, a salesman and I were driving out of the dealer's lot and we drove past a Corvette. I commented that this Jeep will never keep up with that car. The salesman said, if you want a race car, don't buy a Jeep. And, if you want an economy car, don't buy a Jeep. This Jeep has capabilities that no other car has, is fun to drive, and if that is not what you are looking for, turn around and I will show you some other cars that more suit you. I bought the Jeep and I love it! MPG is not all that bad for the heavy duty vehicle that it is. I have thought about a chip for the computer to improve economy, but I bet the engineers have looked at that too. As someone said, it is shaped like a brick, so the faster you go, the more drag you get. Relax and enjoy!
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Old 01-19-2013, 01:30 AM   #47
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I use an ODM scanner in conjunction with an app on my android phone to give me an accurate account of my real time fuel mileage and average mileage during a trip. You can buy an ELM 327 Bluetooth scanner on Amazon for about $20 and I think I paid $1.99 for OBD Droid Scanner App. I don't monitor all the time but it will show you what kind of driving kills your mileage if you are interested in knowing. I have averaged 20 mpg's over 15 tanks of gas and I live in the NC mountains.
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Old 01-19-2013, 03:14 AM   #48
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.........yes you could remove the rear seat and reduce weight.....i did that, but only to make room for a big yellow Lab who is 4 times as heavy as the seat i removed.

i agree with others who say just drive smartly and enjoy your jeep, you'll never get 30 mpg in a 4.0L wrangler.
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Old 01-19-2013, 05:40 AM   #49
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For the almost 5 years I had my stock Jeep, I calculated the mileage at every fill up in my 2001 TJ with a 4.0L, 5spd manual trannny.

I have almost always driven it like a grandpa and always kept in tuned as good as possible. Best mileage I ever got was 20.2mpg. I knew when I bought the thing, it wasn't because of the awesome mileage they get!!
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Old 01-19-2013, 06:51 AM   #50
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.........yes you could remove the rear seat and reduce weight.....i did that, but only to make room for a big yellow Lab who is 4 times as heavy as the seat i removed.

i agree with others who say just drive smartly and enjoy your jeep, you'll never get 30 mpg in a 4.0L wrangler.
You will never get over 20 or so in a 4 banger either. I know.......
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Old 01-20-2013, 07:26 AM   #51
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ELM 327 Bluetooth scanner
Didn't even know they had an iPhone app for these.

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