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Posted on Jan 02, 2017
This should show up easily on the ECU diagnostics computer at a mercedes dealership. Basically your fuel mixture is way too rich causing your car to be heavy on gas, have a raw gasoline smell, and not run right. Something like this can be caused by a defective oxygen sensor (but that usually produces a check engine light) or it might even be a defective ECU. There is really not way of knowing for sure until you do a proper diagnostics where they hook up your exhaust at the same time and do an emmission test. In most cases it's some sensor that needs replacing.
Posted on Aug 28, 2008
I also own a 2008 Jeep liberty and get close to 200 miles per half tank I know I can get close to 380 miles and my gas light comes on.
1 other thing to consider is does it have 4 wheel drive and if so what version?
I have a part time 4 wheel drive so I only engage it when I am in bad weather snow, ice, ect. or if I go off road. My system is not designed to be in 4 wheel mode on dry roads.
If you have a full time 4 wheel or all wheel drive model that will definitely eat up more gas as the engine has to work more to pull and push all 4 wheels all the time.
Not a total solution but I hope it helps give more insight!
Best of luck,
Posted on Feb 17, 2009
Just a silly question...how much driving do you do that is at 10mph? Most times this is less than 5%...so if everything else is fine why be concerned? As far as the why of it, you could have a slight vacuum leak or any number of sensors that are very slightly out of range, not enough to cause a problem, but enough to change mileage expectations. The addition of ethanol to our fuel has also impacted fuel mileage...The dirty little secret about any alcohol fuel is that nearly twice the amount of alcohol is necessary in order to produce the same energy output of gasoline...which will definitely lower mileage. Some power can be "recovered" by increasing compression ratios and changing engine timing (advance)...However today's vehicles are calibrated and built to burn gasoline and cannot without, major mods, be made to use anything but. Alternative fueled vehicles make a compromise in these areas but a compromise is just that.
Posted on Apr 16, 2009
SOURCE: Do I need a new transmission?
try changing the fliud and filter first then if that doesnt help take it too the shop and have it checked out it may just be a computer problem!!
Posted on Apr 22, 2009
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