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Unread 08-24-2011, 04:52 AM   #1
FoxNeverDies
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2005 TJ Wrangler 
 
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Long Haul Fuel Mileage?

Getting ready for a long road trip from Phoenix, Arizona to Juneau, Alaska. Just Graduated college and I'm heading home. I've got a 2001 XJ with a 5.5" long arm kit with 33'x12.50" tires and 4.56 gears and the AW4 4speed auto trans. I'm trying to get as much MPG as I can out of this 4.0L on this long haul trip. I've got new plugs, fresh oil and a clean air filter. I'm wondering if anybody has tried any of the programmer's, chips and what not or anything else that has gotten them some extra MPG's on long trips and would be willing to share some advice any information would be greatly appreciated.


Last edited by FoxNeverDies; 08-24-2011 at 04:54 AM.. Reason: forgot to add something
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Unread 08-24-2011, 06:21 AM   #2
XJ9694
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You could also try an intake spacer. It give you better airflow and more low end torque. It isn't much but every little bit helps!
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Unread 08-24-2011, 07:28 AM   #3
Stang_Man
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You have a good start, your best bet is going to be keeping your foot out of it!

Aim for 55-65, depending who you ask. Be gentle with throttle inputs, "coast" downhill feeding throttle slowly to build speed, it'll help you get further up the next hill without having to give it too much gas.
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Unread 08-24-2011, 07:33 AM   #4
mattyjeep
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Just drive it. It is what it is. I know it's a long trip so enjoy the ride and just make sure everything is in good working order. You geared for the bigger tires so you are probably doing the best you can do. Your right foot will make more difference than anything you can bolt on. Don't waste money on bolt ons and spend it on doing anything that will prevent unplanned repairs. One unplanned problem could cost more than your fuel for the whole trip.
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Unread 08-24-2011, 09:00 AM   #5
wrangler1988
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Quote:
Originally Posted by XJ9694 View Post
You could also try an intake spacer. It give you better airflow and more low end torque. It isn't much but every little bit helps!
Actually save the money on that since they do nothing and put it towards your fuel bill!
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Unread 08-24-2011, 09:07 AM   #6
bdodge
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Quote:
Originally Posted by wrangler1988 View Post
Actually save the money on that since they do nothing and put it towards your fuel bill!
True, spacers do nothing noticable, maybe a .13 mpg increase. I get 14 mpg at 70mph down the highway, if I drop down to 65 it's like magic and I get 18-19 mpg. If you chip it, one that actually works will be at least $400 (the 10-20 dollar ones on ebay don't work) but if you do get a real chip, then you're looking at upgrading injectors, exhaust, mild cam... to even notice it. All in all the best you can do has already been done, pick a speed around 2200-2300 rpms and that should get you your best mileage. Enjoy the ride!
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Unread 08-24-2011, 09:46 AM   #7
XJH-007
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Quote:
Originally Posted by Stang_Man View Post
You have a good start, your best bet is going to be keeping your foot out of it!

Aim for 55-65, depending who you ask. Be gentle with throttle inputs, "coast" downhill feeding throttle slowly to build speed, it'll help you get further up the next hill without having to give it too much gas.
X2

END THREAD HERE.

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Unread 08-24-2011, 09:55 AM   #8
No4x4Yet
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Quote:
Originally Posted by bdodge View Post
True, spacers do nothing noticable, maybe a .13 mpg increase. I get 14 mpg at 70mph down the highway, if I drop down to 65 it's like magic and I get 18-19 mpg.
Drag increases by a factor of 4 with speed an dwith our lovely box on wheels that really makes a difference.
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Unread 08-24-2011, 10:46 AM   #9
Topgun514
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I'd say the most you should do is bored TB and a free-er flowing muffler. Other than that just enjoy the trip!

FTR, I have a bored TB to 60 mm(Largest on Renix) and no muffler- waiting on a welder. My last trip was 300 miles on the tank without corrected speedo due to 31's and 3.07 gears. This averages about 330 miles to the tank. The tank I approximate was 17.5 gallons full until my approximate "close to empty". Thats about 18.86 MPG.

150 Miles were Highway but fully loaded on a camp trip, about 700 lbs loaded extra
50 Miles Highway, 2 other passengers
100 Miles City
***30 Miles 4HI and 4LO offroading***

I have also taken out the air intake silencer and cut a hole on the firewall side of the airbox.
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Unread 08-24-2011, 12:33 PM   #10
FoxNeverDies
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Thanks for all the suggestions. I'll possibly look into the bigger Throttle Body I've read up on some stuff saying it's supposed to do the trick, but never heard from any one person per say that can actually attest to it. I have a Borla Cat back exhaust on it right now, so I would say the "free flowing" exhaust is covered. I'll look into the possibility of the throttle body perhaps if it's in my broke college kid budget. :P
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Unread 08-24-2011, 12:45 PM   #11
bvfd09
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You should look into actually HOW anything such as a throttle body spacer will help you before dropping your cash. Here is some info I found. (Spoiler alert: save the money for gas instead of trinkets)

The Theory
The throttle body spacer is based on the theory that air entering a chamber will have a greater velocity and more mass if it spun. The helical groves on the throttle body spacer are designed to make the air start spinning as it passes through the grooves, thus delivering a greater volume of air to the ic engines cylinder and in turn, increasing the power of the detonation by adding more air to the fuel/air mixture. Additionally on older model vehicle with throttle body injection, the swirling air mixes the air and fuel much better, providing a more consistent spark and hotter detonation. More Air & stronger detonation = more Power. In addition to the increased power claims there is the claim that you will also experiance gains in fuel ecconomy as less fuel is required to make more power, meaning you will be able to save gas (up to 10% if you believe some of the manufacturers) if you don't alter your driving habits.

The Reality
Late model fuel injected cars and trucks have their fuel and air mixed just prior to being injected into the combustion chamber, meaning all the swirling going on in the intake manifold isn't happening with the fuel, so the "mixing" of the air and fuel doesn't happen. Older, carburated vehicles and ones with throttle body injection (older than a '95) can benefit from this swirling motion, however your brand new port injected Chevy Siverado isn't going to benefit at all from this action other than making a weird high pitch noise from under the hood that some kid might mistake for a turbo.

The Facts
We equipped a 2001 Ford Super Duty V-10 with an aftermarket throttle body spacer made by one of the name brand manufacturers out there. Prior to this test the truck had been modified with a cold air intake system and full 3.5" exhaust system from the headers back. When getting a baseline dyno, the best pull rendered 283.4 hp and 361.4 lb-ft torque (corrected for 93°F) at the rear wheels. After the addition of the throttle body spacer, the best we could pull 281.1 hp and 354.7 lb-ft torque. Now, we will concede that the engine was getting hotter and so was the day by the time we had the throttle body spacer installed (approx. 20 mins later) but according to the manufacturer we should have had an "noticeable increase in power" which is contrary to the reports generated by the Dynojet.

Popular Mechanics debunked a few "fuel savers" a few years ago. Read the article here. http://www.popularmechanics.com/cars...1802932?page=1
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Unread 08-24-2011, 02:49 PM   #12
Virginia John
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I have an '01 with K&N, 60mm TB, 4 hole injectors, flow through cat, flowmaster 70 and 2 1/2 pipe. On a recent trip of over 800 mi (primarily super slab @ 70 MPH) I got over 22 MPG overall and 24 MPG on the highway (calculated).
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Unread 08-24-2011, 03:45 PM   #13
XJmallcruiser
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Where did you get your 4 hole injectors?
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