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Unread 07-01-2012, 07:50 AM   #1
jklanier84
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2002 KJ Liberty 
 
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Location: Orlando, Florida
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checking my mpg

Okay so I know its a Jeep and mpg is gonna be awful anyway but here's the thing.

Friday I went to the beach with four people, the dog, and coolers. We ran the air the whole way and I ran 65-75 using cruise controll. Ended up getting 20mpg. Which I though was just fine considering the variables.

However, on my daily comute, which is all stop and go, light to light, I never use the air, never hit 2,500rpm, and never get past 45-50mph. Gas mileage in town? 12mph.

Wtf?! Is riding no a/c windows down making my jeep a giant parachte, am I lugging the motor too long at low rpm? Should I just run the air on low , leave the windows up, and accelerate a little harder?

Nothing is mechanicly wrong with her other than I need to change the diff and tcase fluids.

Any comments guys? I dunno but it seems that I should be getting a little better in town mileage. Should I clean the throttle body? If so how?

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Unread 07-01-2012, 08:42 AM   #2
sens
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Sounds about right for stop and go. My gas mileage round town is absolutely dire. Just the stop and go stuff that kills it.
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Unread 07-01-2012, 08:49 AM   #3
jklanier84
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Crap. Its the one and only time I was HOPING something was wrng with my jeep.
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Unread 07-01-2012, 09:16 AM   #4
streetglideok
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Stop and go, plenty of florida swamp heat, heavy vehicle, its not going to be good. Mileage probably would barely change with the a/c honestly. Why punish yourself down there?lol. Taking off is where you burn your fuel, and you cant help that. However, anticipate traffic and lights, try to coast without braking, etc. That will do wonders.
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Unread 07-01-2012, 09:31 AM   #5
jklanier84
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Sad part? I'm already doing that. Am I babying it TOO much by accelerating too slowly I barely use the go pedal and let it shift at 2000rpm.

12mpg just seems like something is wrong. 15mpg I would be okay with.

Guess ill try cleaning the TB, maybe changing diff and tcase fluids might help by reducing friction, and I'm chucking my "cold air". Back to paper!
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Unread 07-01-2012, 11:05 AM   #6
streetglideok
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Cold air systems are rarely true cold air systems and with stop and go driving, hurt performance. Babying too much can hurt mileage as well as hammering the gas. Taking off initally with light throttle, then progressively more throttle will give you better results. Utilize the torque output of the engine, which is the acutal output power, with the higher gears and more throttle then. I probably get 14-15 here in town, but I have a 6speed manual, so I have an advantage.
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Unread 07-01-2012, 11:20 AM   #7
04liberty4x4
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When is the last time you changed your spark plugs?


I was getting 12mpg-13mpg too in the city, now getting around 15.9-16.2 on average in 100% city.
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Unread 07-01-2012, 11:22 AM   #8
jklanier84
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changed them about 1,500 mi ago...
it runs way better, but mileage didnt change much
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Unread 07-01-2012, 12:07 PM   #9
04liberty4x4
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Quote:
Originally Posted by jklanier84 View Post
changed them about 1,500 mi ago...
it runs way better, but mileage didnt change much
That is odd, what did you gap them at?
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Unread 07-01-2012, 12:13 PM   #10
jklanier84
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.040
They came perfect out of the box.
I'm just really confused bc everyone else is getting 14-15mpg. There's nothing wrong with my libby that I know of.
I gutted the PCV valve last night hoping to see if that changes anything.
The only other thing I can think of is I have a small exhaust leak somewhere, but its not bad enough for me to crawl under it. Also the tcase and diff fluids, but I don't see eithet of those affectng mpg
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Unread 07-01-2012, 01:12 PM   #11
04liberty4x4
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Quote:
Originally Posted by jklanier84 View Post
.040
They came perfect out of the box.
I'm just really confused bc everyone else is getting 14-15mpg. There's nothing wrong with my libby that I know of.
I gutted the PCV valve last night hoping to see if that changes anything.
The only other thing I can think of is I have a small exhaust leak somewhere, but its not bad enough for me to crawl under it. Also the tcase and diff fluids, but I don't see eithet of those affectng mpg
Tire pressure?
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Unread 07-01-2012, 01:20 PM   #12
jklanier84
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Its spot on.
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Unread 07-01-2012, 03:08 PM   #13
04liberty4x4
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Quote:
Originally Posted by jklanier84 View Post
Its spot on.

I give up, adding an intake, new spark plugs, and proper tire pressure got my MPG back.


My only other guess would be oxygen sensor?
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Unread 07-01-2012, 10:47 PM   #14
streetglideok
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Quote:
I gutted the PCV valve last night hoping to see if that changes anything
That doesn't do anything, but cause your engine to start ingesting oil thru the pcv valve. More problems to come. I would strongly suggest, before you make alterations in desperation, learn what the parts do, and how they work. That will save you money, and fuel in the long run.

One thing that crossed my mind, what octane fuel are you running, 87, 89, 91, 92, 93, etc?
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Unread 07-02-2012, 12:20 AM   #15
sens
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Sheesh, I knew the US paid less for fuel but got lower octane but I didn't realise how much. Mine has 98 or 99 octane in it!
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