My goal is to get 25+ mpg from my 99 XJ with 30 x 9.5 R15 ATs - Page 2 - JeepForum.com
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post #16 of 3297 Old 07-21-2013, 09:33 PM Thread Starter
Charley3
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Quote:
Originally Posted by MoparMech View Post
It's a Jeep......if you want good mileage get a Dart.
I just got it from 16 to 22 mpg highway. So clearly it can be improved.


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post #17 of 3297 Old 07-22-2013, 04:40 AM
Newtons3
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Absolutely. I went this path with one of my 95 2wds and regularly got 21-22, real world. I know it can be done but, at some point, the desire to run bigger tires, more lift, and make more power make mileage take a back seat. The two paths are opposing goals. That said, improvements are achieveable.
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post #18 of 3297 Old 07-22-2013, 07:50 AM
Azzy
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You want 25+ Mpg?

Change your mill. http://www.mercedesdiesel4x4.com

Im the guy who makes new gauges, check out our gallery at Teamadw.com
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post #19 of 3297 Old 07-22-2013, 08:54 AM
cbenez1
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While I read this I see a lot of these cam swap and aerodynamic suggestions and wonder, After spending the money and time to undergo them, How much have you saved ?

A nation that forgets it's defenders will itself be forgotten

01 Up Country 6.5 long arm
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post #20 of 3297 Old 07-22-2013, 09:47 AM
mschi772
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Quote:
Originally Posted by cbenez1
While I read this I see a lot of these cam swap and aerodynamic suggestions and wonder, After spending the money and time to undergo them, How much have you saved ?
For some people it's not simply an economic equation. For me, there is value inherent to improving upon an existing design, solving a problem, reducing negative environmental impact, or simply achieving something uncommon/difficult. I do a lot of things not expecting them to save me money/pay for themselves.

Build Thread -- http://www.jeepforum.com/forum/f177/whats-chrokeese-build-thread-2525690/
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post #21 of 3297 Old 07-22-2013, 03:22 PM
Kevin108
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How are you determining your mileage?

My build thread has pics again. http://www.jeepforum.com/forum/f177/kevin108s-2000-xj-build-867428/
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post #22 of 3297 Old 07-22-2013, 03:40 PM
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Well said mschi772.
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post #23 of 3297 Old 07-22-2013, 04:55 PM
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Originally Posted by mschi772 View Post
For some people it's not simply an economic equation. For me, there is value inherent to improving upon an existing design, solving a problem, reducing negative environmental impact, or simply achieving something uncommon/difficult. I do a lot of things not expecting them to save me money/pay for themselves.
I'm the same way, but in a different way. lol. If I could figure out how to get a powerstroke under the hood I would. I am sure I could get 25mpg out of it.

99 XJ, black, 4x4, NP231, 8.25 rear. Fully locked.
5.5" long arm lift, 35x12.5x15 Kumo KL71MT
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post #24 of 3297 Old 07-22-2013, 06:52 PM Thread Starter
Charley3
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Instead of CAI you might look at hot air. This is the way the hypermilers get the computer to lean out the fuel mix even more.
My AFE "cold" air intake isn't a cold air intake. That's just AFE marketing hype.

It draws air from same place as stock air box, but is much free'er flowing.

So it's a high flow warm air intake.

My 205F thermostat helps keep things warm.

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post #25 of 3297 Old 07-22-2013, 06:53 PM Thread Starter
Charley3
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Not necessarily. There's no reason a muffler of the same type with the same size tubing will flow more air with less restriction.
I intend to use larger tubing.

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post #26 of 3297 Old 07-22-2013, 06:58 PM Thread Starter
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How are you determining your mileage?
I fill up before and after a road trip. I'm only testing highway mileage.

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post #27 of 3297 Old 07-22-2013, 07:10 PM
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Not that it's throwing your MPG estimates wildly out of whack, but if you can fill-up at the same pump at the same time of day, your calculations will be more accurate. Pumps vary, orientation of the vehicle at a given pump can alter when "full" happens, and temperatures can affect the volume of fuel that actually gets delivered per gallon (cooler mornings means denser fuel which means more bang for your buck).

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post #28 of 3297 Old 07-22-2013, 08:29 PM
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Take backseat out and all bumpers off too.
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post #29 of 3297 Old 07-22-2013, 08:50 PM
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Originally Posted by mschi772 View Post
Not that it's throwing your MPG estimates wildly out of whack, but if you can fill-up at the same pump at the same time of day, your calculations will be more accurate. Pumps vary, orientation of the vehicle at a given pump can alter when "full" happens, and temperatures can affect the volume of fuel that actually gets delivered per gallon (cooler mornings means denser fuel which means more bang for your buck).
I check fuel mileage religiously on every vehicle I drive. It's a bit of an OCD for me. That said I always hate to quote a single tank. I have never found that ambient temperature of the fuel when I fill up makes any noticeable, trackable difference. In our state, the pumps are tested and regulated and you can be assured of their accuracy. The tolerance between pumps is negligible. Unless I've made some change to one of my Jeeps, the biggest factors affecting my fuel economy are average speed, air temp, a/c duty cycle, and humidity. Methanol as an oxygenate factors in, but that's purely mathematical.
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post #30 of 3297 Old 07-22-2013, 09:19 PM
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Quote:
Originally Posted by mschi772 View Post
For some people it's not simply an economic equation. For me, there is value inherent to improving upon an existing design, solving a problem, reducing negative environmental impact, or simply achieving something uncommon/difficult. I do a lot of things not expecting them to save me money/pay for themselves.
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