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Unread 05-12-2012, 05:57 PM   #1
04liberty4x4
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Join Date: Sep 2008
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Holy MPG!!!!!!!!!!

Holy crap, finally solved my terrible MPG problem.


Changed my spark plugs, and mileage went from 15 mixed to 24.7 MPG.



First I aired the tires up, no change, then new air filter, nothing, then new oil and a fuel cleaner, nothing, spark plugs were next, and BOOM my MPG's are back!

I bought the car in 2008 used with 65k on it, the dealer said they changed the spark plugs, WELL HE LIED. It just turned over 99,000 and I knew it was over due for the 30K spark plug change but when I took them out, they were the ORIGINALS TO THE CAR! They measured from .077 to .082, WOW.

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Unread 05-12-2012, 10:41 PM   #2
kbrady
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What spark plugs did you get??? I just changed mine but I'm getting 16 MPG
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Unread 05-12-2012, 11:55 PM   #3
04liberty4x4
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I just put in the NGK V-power copper plugs, nothing fancy, $2.19 each at autozone
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Unread 05-13-2012, 05:06 PM   #4
jeepkj617
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Quote:
Originally Posted by 04liberty4x4 View Post
I just put in the NGK V-power copper plugs, nothing fancy, $2.19 each at autozone
Yup, thats just what I installed today and what I installed 12k miles ago. The ones that came out looked great but I used a coupon when I bought my diff fluid that gave me free plugs, anti seize, and dielectric grease.

When I installed I got a 3 mpg boost but I'm still averaging 15 ish - it has alot to do with weights and add-ons I think. Im replacing my diff and tcase fluids (slowly) hoping for better mpg as well.
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Unread 05-13-2012, 08:57 PM   #5
04liberty4x4
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Quote:
Originally Posted by jeepkj617 View Post
Yup, thats just what I installed today and what I installed 12k miles ago. The ones that came out looked great but I used a coupon when I bought my diff fluid that gave me free plugs, anti seize, and dielectric grease.

When I installed I got a 3 mpg boost but I'm still averaging 15 ish - it has alot to do with weights and add-ons I think. Im replacing my diff and tcase fluids (slowly) hoping for better mpg as well.
Yea my mileage had really been tanking lately, and I had been putting off doing the spark plugs for awhile, and replacing them made a BIG difference for me(best tank average MPG I've ever had after changing them..)
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Unread 05-13-2012, 09:15 PM   #6
HustlinFlip
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Cleaning out your fuel system may help too if not done already.

I was averaging 16ish but used STP Complete Fuel System Cleaner (just add to a tank that's at least half full) and BAM! back to the rated 19 mpg.
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Unread 05-14-2012, 02:46 PM   #7
jp7794
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Holy spark plug gap Batman! .077 to .082 is enough to light a cigarette off of.
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Unread 05-15-2012, 08:18 AM   #8
Oregon187
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Quote:
Originally Posted by 04liberty4x4 View Post
Holy crap, finally solved my terrible MPG problem.


Changed my spark plugs, and mileage went from 15 mixed to 24.7 MPG.



First I aired the tires up, no change, then new air filter, nothing, then new oil and a fuel cleaner, nothing, spark plugs were next, and BOOM my MPG's are back!

I bought the car in 2008 used with 65k on it, the dealer said they changed the spark plugs, WELL HE LIED. It just turned over 99,000 and I knew it was over due for the 30K spark plug change but when I took them out, they were the ORIGINALS TO THE CAR! They measured from .077 to .082, WOW.
Double-Banned for calling a Jeep a car twice in one post.
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Unread 05-15-2012, 07:38 PM   #9
chachums
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Quote:
Originally Posted by Oregon187 View Post
Double-Banned for calling a Jeep a car twice in one post.
lolz so true
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Unread 05-15-2012, 07:46 PM   #10
kirbyZJORVIS
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Man u guys got it great I'm getting about 12.4 in my V8. ZJ with 3.5 in lift and 31s I litterally drive .5 miles to work 1 stop. Thinkin hard should I get new calipers and rotors or plugs and wires. ( Have a very very small wobble round 50 if i just barely hit the brakes) so prolly do brakes first. Thank god that's easy and keep I'm used to a jap trucks lol. Loveliness my new ZJ!!!!
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Unread 05-15-2012, 10:39 PM   #11
tommudd
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Keeping up on all maintenace helps a lot for sure.
I get over 20-21 all the time on a trip and I dare say I am heavier than 90% of the KJs out there
Got 19.4 the other day pulling a trailer with garden tractor and a bunch of other stuff piled in it! And that was 70-75 most of the way
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Unread 05-15-2012, 11:31 PM   #12
SabaII
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Quote:
Originally Posted by tommudd View Post
Keeping up on all maintenace helps a lot for sure.
I get over 20-21 all the time on a trip and I dare say I am heavier than 90% of the KJs out there
Got 19.4 the other day pulling a trailer with garden tractor and a bunch of other stuff piled in it! And that was 70-75 most of the way
Them darn Kilimanjaro Edition KJ's getting better then everyone else.

I just did plugs but still around 15 mpgs mixed. I have other Issues I think though. I will check my highway mileage this weekend and see if that bumps it.
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Unread 05-18-2012, 02:12 PM   #13
CRD_Joe
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That's great news and great mpg for a gasser. I just drove from Seattle to Phoenix and I averaged 36.5mpg. I was happy with that. I just installed the trans tune from GDE and Im hoping to get 38mpg on the way home.
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Unread 05-21-2012, 07:56 AM   #14
MoD
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i changed to an amsoil filter and i changed the spark plugs (they had 135K miles) and went from an average of 21.3 to 24.9!!
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Unread 05-21-2012, 11:15 AM   #15
cowboyjack
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I have been looking at getting better fuel mileage on my wives 05 liberty, I put the chevron technician fuel cleaner in maybe 10,000 miles ago and I stay on top of maintenance. I just did a oil change and yesterday and put regular oem champion plugs in and so far it only gets 17.2 mpg which it was getting before. Should I just get different plugs? she will be driving to work one hour one way all highway and I am trying to get every mpg out of the jeep that I can. Should i consider an aftermarket intake and if so which one? I hope it is just the plugs, would be a cheaper route. thanks for any input
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