4.0 sucks too much fuel, replaced a bunch of junk, no difference. - Page 3 - JeepForum.com

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post #31 of 43 Old 08-11-2012, 01:17 PM
jjshbetz11
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Quote:
Originally Posted by jjshbetz11
Drive like there's a egg between the skinny pedal and foot. Draft semi's whenever possible, pizza cutter tires, little higher than normal tire pressure, open element air filter, new plugs, no muffler, and reset PCM. Don't know the mileage I get but I travel a hundred miles a day 5 to six days a week. A full tank on Monday morning gets me to Thursday. I have to refill on Friday. That's roughly 400 miles to the tank. Also keep rpm at 2k or less

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post #32 of 43 Old 08-11-2012, 01:35 PM
Reptile
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Originally Posted by DerMeister View Post
Unless youre referring to the use of AC, how does summer heat negativley affect mileage? The general notion is that it is better for mileage for several reasons.
It's affecting air density.
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post #33 of 43 Old 08-11-2012, 02:10 PM
xj_noob
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Quote:
Originally Posted by jjshbetz11
Drive like there's a egg between the skinny pedal and foot. Draft semi's whenever possible, pizza cutter tires, little higher than normal tire pressure, open element air filter, new plugs, no muffler, and reset PCM. Don't know the mileage I get but I travel a hundred miles a day 5 to six days a week. A full tank on Monday morning gets me to Thursday. I have to refill on Friday. That's roughly 400 miles to the tank.

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That's unreal Hahaha
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post #34 of 43 Old 08-11-2012, 08:19 PM
jjshbetz11
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That's an estimate, but ya, is what it is. These are highway and country miles were talking, in the city it's a totally different game.

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post #35 of 43 Old 08-11-2012, 10:00 PM
DerMeister
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Quote:
Originally Posted by Reptile View Post
It's affecting air density.
Yes exactly, but in the opposite way. Colder denser air reduces mpg, and warmer less dense air is better for mpg. Not only for resistance, but there is less oxygen in the combustion chamber because of this which causes the computer to lean out the mixture.

Lots of things on this when you google it. Humidty also causes the air to be even less dense.

That and fluid viscosity, warm-up times, and gasoline blends.
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post #36 of 43 Old 08-14-2012, 11:45 PM
rosco219
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Quote:
Originally Posted by jjshbetz11 View Post
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how did you reset your PCM
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post #37 of 43 Old 08-15-2012, 04:51 AM
jjshbetz11
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You unhook pos and negative battery cables and touch positive cable to a ground source( ac comp) then hook cables back back up. Then turn key to run but don't crank it. Then with key still in run, turn on headlights, then turn off headlights. Then start it up. That's it.

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post #38 of 43 Old 08-15-2012, 06:06 AM
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Quote:
Originally Posted by Azzy

Seafoam doesnt do squat. Other than waste money, overheat your cat, and annoy the neighborhood.

If your injectors are dirty, swap them with newer ones. Might help.
So a 10 dollar can of cleaner doesn't work but you want to drop about 40 to 60 bucks for just one injector and there are 6 of them so how is that better? Start cheap then work your way to the expensive fixes
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post #39 of 43 Old 08-15-2012, 07:37 AM
rosco219
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Quote:
Originally Posted by jjshbetz11
You unhook pos and negative battery cables and touch positive cable to a ground source( ac comp) then hook cables back back up. Then turn key to run but don't crank it. Then with key still in run, turn on headlights, then turn off headlights. Then start it up. That's it.

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sounds like your joking ?

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post #40 of 43 Old 08-15-2012, 07:42 AM
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I run 4.5 with 33x12.50 KM2s. I run my tires at 28 psi and I got 15-17 before I did the injectors. Havent run a full tank yet, but I can already see an increase in what gas I did have in it. (I also had a leaky injector, upgraded to the neons)

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WTF is Clockspring??? my Jeep has digital clock
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post #41 of 43 Old 08-15-2012, 08:02 AM
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About how much did those injectors cost?
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post #42 of 43 Old 01-29-2013, 06:31 PM Thread Starter
DoctorTim
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its been a while. thought i'd let you all know whats been going on lately with my MPG. I got 4.10 gears, 33" BFG all terrains. and i used an online calculator to find out how much i need to adjust my calculations due to different gear ratios and tire sizes compared to stock. been using the same way of measuring the amount of fuel consumed after driving X miles. Also did a long 2 hour drive into the mountains but most of it was on long stretches of freeway. during this trip, i averaged 15.5MPG. around town, to and from school, i get an average of 13.1 MPG. this is little better than what i had earlier, but im still jealous of the MPG the rest of you seem to be getting. My tire is still on the top as i cant fit a 33 in the trunk. but back when i still have 31s i had it in the trunk for a while and my MPG got better by less then 0.5 so it does make a slight difference. I am already doing a little research on neon injectors. any news from those who have done that already?

http://www.jeepforum.com/forum/f11/96-xj-build-hybrid-1311863/

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post #43 of 43 Old 01-29-2013, 07:56 PM
sAe23
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Do you have access to a GPS, or GPS functions on a smart phone, to record *actual* miles traveled instead of relying on calculated miles?

And just to add (not very much) to the whole mileage discussion (of the week), I get between 12 and 15 MPG (typically 13.x) "around town" and 17-19 on extended highway trips (at extended highway speeds *cough*).
I don't recall specifically what my mileage was before the lift, but it wasn't drastically different; and it's stayed the same with the spare on the roof.

We drive Jeeps, not econo-boxes
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