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Unread 05-27-2011, 12:46 PM   #61
01CHEEKEE
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Fresh plugs, auto plats, home from ocean city (169.9 mi), gOT 22.25 mpg...and that's driving 80, filled w/ luggage and two bikes hanging out back... Very happy! ESP considering before the plug change we were gettin horrible mileage

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Unread 05-27-2011, 01:12 PM   #62
LibertyOrDeath
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Quote:
Originally Posted by 01CHEEKEE View Post
Fresh plugs, auto plats, home from ocean city (169.9 mi), gOT 22.25 mpg...and that's driving 80, filled w/ luggage and two bikes hanging out back... Very happy! ESP considering before the plug change we were gettin horrible mileage
How many miles on your KJ?

I argued with my wife about this (bad idea) but, if you fill up at different stations where the pumps cut off at different tank fullness levels, this whole MPG thing based on 1 fillup is pretty inaccurate, it really needs to be spread over more miles/fillups or, that you fill back up using the EXACT SAME pump at the same station and, getting really nerdy, ideally in the same temperature or close to it. If you start off on a truly FULL tank, drive 200 miles, fill it up at a station where the pump cuts off lets say, 1 gallon or even 1/2 short of how much was in there before, it will have big impact on your perceived MPG.

If you really used 10 gal to go 200 miles but that other gas pump stopped after putting only 9.5 gal back in, you think you went 200 on 9.5 = 21.05MPG, when in fact you used 10 gal and you got only 20 MPG.

And tire air pressure if it changed or driving on hot versus cold road conditions, other traction issues.

Lots of myths about fuel buying, buy it when its morning and cold, don't put the pump on high, all debunked but one tip is good - a good healthy gas cap will save you money in fuel loss, letting the tank breathe while trapping gas vapor = money.

Ok so I'm bored at work I admit it.
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Unread 05-29-2011, 01:32 PM   #63
paparod
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2006 CRD, with 35 000 miles on it and I get a 16,5 MPG in city driving. I just had maintenance (fluids + filters changed) and the car is pretty much to stock standard, i.e. no lifts etc.

Going highway it increases to a rough 27 MPG...Almost a 50% difference and I must admit I am bit surprised by the low mileage in citydriving...
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Unread 05-29-2011, 11:37 PM   #64
01CHEEKEE
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Wow yeah that's really low for crd...our gas gets nearly that, and some get that and better...
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Unread 05-30-2011, 01:08 PM   #65
paparod
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We'll that's my gripe. I really like the car, but mileage sucks.

Anyone with expercience in using engine-tuning from e.g. Green Diesel Engineering?
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Unread 05-30-2011, 03:55 PM   #66
95BadBoy
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Quote:
Originally Posted by paparod View Post
We'll that's my gripe. I really like the car, but mileage sucks.

Anyone with expercience in using engine-tuning from e.g. Green Diesel Engineering?

I was like one of the first few in the country to use GDE's tune. Had it loaded two days after picking up the little tractor, while driving it back from NH. Very knowledgeable folks when it comes to these VM diesels. They were actually in on the original software if I recall for these B4 DC decided all they wanted it to do was start - period.

Did wonders for the highway mpg's when driving it in the sweet spot @ about 1800 rpm. Big increase in felt torque, smoother throttle tip in, eliminates the potential for any EGR failures , quite a few other little tweaks. Went from 26 to mid 30's on highway mpgs. Had 1800 miles to really test the before and after effects. Very good stuff. Never really check city mileage, way too many things affect those numbers.

If I keep adding things to this rig - pretty sure I can get it back down to the original fuel econ though.
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Unread 05-30-2011, 04:05 PM   #67
dcxman
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With GDE you can expect about a 15% improvement in mileage not to mention the increased torque. An 05 will do even better.
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Unread 05-30-2011, 06:42 PM   #68
Libbyowner
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I use Bosch Platinum+4/Spark Plug, which you can get it from autozone for 5.99 a piece. My libby is a 2003, so I believe it has a 17.5 tank in it. I am not sure what you mean by mileage, but it has just over 202,000 miles on it, and I am getting about 350/tank. (80% highway and 20% city)
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Unread 08-29-2011, 03:38 PM   #69
All3Sports
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Last tank I got 280 and I'm at 100 with half a tank left, hope its not my driving, insurance is a %&@^ already when you're 17..
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Unread 08-29-2011, 06:26 PM   #70
streetglideok
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46k miles on my '05 KJ 6speed, champion copper plugs in it with only 1k on them. I have 350 miles on this tank, and Im down just below the 1/4 mark now. Running midgrade gas, as it seems to run alot better with it, but granted, here in the mile high state, we have 85, 87 and 91 octane.
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Unread 09-07-2011, 05:09 AM   #71
Drewskii37
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I just got a 2005 Liberty and at first was worried about the MPG's since I traded in an 04 Mazda 6S but so far so good! i'm at about 250 miles on my first tank of gas and still just over 1/4 tank left! This Liberty has a 2 Gallon bigger tank so honestly i'm not too worried about it now since i'm seeing that like most people I feel confident I can get 300+ miles per tank which I barely got with my mazda in town. Maybe because i'm not such a lead foot with this suv! lol
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Unread 09-07-2011, 12:20 PM   #72
Boomerang
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I have an '06 Limited 3.7L 40k miles
I changed what appeared to be the original plugs at 38.5k, gapped at .035
Had new oil from the dealer. I was getting about 15-16 MPG
I changed the plugs (.040 gap correction) then changed them again at about 40k after using Seafoam in the oil, gas and vaccum lines. The treatment did not foul my plugs, but i put in new ones anyways (the plugs I had put 1k on still looked new, no carbon, ect..

Afterwards I put in an Amsoil air filter and synthetic 5W-30 plus their brand nam oil filter. Mileage so far has risen to about 17.5 and this includes mostly highway.

The oil/oil filter I put in says its good for 25k, but only if you use premium gasoline, cannot get the claimed 25k with the recommended gas for the Liberty.

I'm hoping that once the oil has worked in really well the mileage will go up. The seafoam treatment truly did wonders for my Jeep. It has brought back lost horses and is massively more responsive. Much smaller increases in the throttle have given much bigger responses, and I mean much bigger.

Consider this an experiment, I'll let you know if I gain further MPG.
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Unread 09-07-2011, 12:55 PM   #73
streetglideok
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Last tank was 362 miles, and took 19.5 gallons to fill the tank. That included going over a 13k foot pass and crawling for hours in 4low. Curious about amsoil wanting the use of premium fuel though for 25k mile oil changes. That can lead to more problems.
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Unread 09-07-2011, 06:27 PM   #74
tjkj2002
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Last fillup..........

112 miles(corrected) and 12.4 gallons to refill,loved every minute of it as 3 gallons was used over 7 miles in 4low going a average of 1.6mph.
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Unread 09-08-2011, 06:50 AM   #75
Ridin' Around
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Quote:
Originally Posted by Boomerang View Post
The oil/oil filter I put in says its good for 25k, but only if you use premium gasoline, cannot get the claimed 25k with the recommended gas for the Liberty.
Just curious where this recommendation came from? In all of the training & literature I have, they simply ask that you use the fuel type recommended by the OEM.
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