I just purchased a used 08 Jeep Liberty Limited. It had about 5500 miles on it. I am noticing that I am getting about 200 miles per tank, roughly 11 MPG and that seems very low. It is an automatic transmission with a 6 cylinder 3.7 liter engine. Most of my driving is city but from what I am reading a lot of people seem to be getting better mileage.
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Now this depends on the climate and mileage if you live in a dry hot climate then around 6/7 years or around the 80K miles ,but if you live in a more temperate climate then around 10 yrs or 100,000miles
THIS BULLETIN SUPERSEDES TECHNICAL SERVICE BULLETIN 08-006-08, DATED
FEBRUARY 22, 2008, WHICH SHOULD BE REMOVED FROM YOUR FILES. ALL
REVISIONS ARE HIGHLIGHTED WITH **ASTERISKS** AND INCLUDE AN UPDATED
OVERVIEW, REPAIR PROCEDURE AND LABOR TIME.
THE StarSCAN® FLASH FILES FOR THIS BULLETIN MUST BE RETRIEVED FROM
StarSCAN® SOFTWARE LEVEL MUST BE AT RELEASE 8.05 OR HIGHER FOR THIS
StarMOBILE STANDALONE MODE OR StarMOBILE DESKTOP CLIENT MAY ALSO
BE USED TO PERFORM THIS PROCEDURE.
Flash: Driver/Memory Seat or Driver Power Seat Functions Intermittently
This bulletin involves selectively erasing and reprogramming the Memory Seat Module
(MSMD) **and performing calibration on the MSMD with the STARScan.**
2008 (KK) Liberty
2008 (RT) Caravan/Town & Country
NOTE: This bulletin applies to RT vehicles with sales code JT2 and KK vehicles with
sales code LEW built prior to September 21, 2007 (0921XXMDH).
The driver/memory seat and or driver power seat functions can become intermittently
inoperative due to a Memory Seat Module software issue. A software design change has
been made to eliminated these intermittent conditions.
change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.
Did this happen overnight or was it a gradual loss? Did you do any kind
of repair before you lost the gas mialage? Is there a check engine
light on or did it come on and go off? Did anything weird happen before
the jeep got bad gas mileage? It's hard to diagnose a problem like this
without actually touching the car.
Any other info might help me steer you in the right direction.
when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.
There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.
to increase gas mileage make sure you keep on top of tire air pressure you can also have your tires filled with nitrogen instead of air also a K&N air filter does wonders and is good for lifetime worth every penny. another smart move is to use a fuel system cleaner regularly Lucas makes great products for this try local parts store.