Im new here and i need some advise
I recently purchased used Jeep kk year 2008
everything run fine, no mods on it everything stock expect the tire 245/70/16 on it
after i fill the tank full im getting 300KM only
im not sure what does it convert to MPG, i know a little about L/KM
recently i changed engine oil and all brand new NGK spark plug but still there is no difference
anyone out tere with 2008 KK is this normal fuel consumption ? if its not what can i do to improve it ? how many KM i should be getting with KK?
That's only 185 miles to a tank, which in my experience is very low. How many liters (or gallons) are you putting in when you refuel? When the fuel light in mine goes on, it will take approximately 17 gallons (75 liters) to fill the tank.
185 mi / 17 gal = 11 mpg (or 21 L / 100 k), which is bad. You could get mileage like that if you are driving completely in the city with lots of stop lights and stop signs, but I used to get at least 14 mpg in those situations. The Jeep should be getting 20+ mpg on highway trips.
I was going to suggest changing the spark plugs, but you've already done that. Next, have a look and see if your engine air filter needs changing. It might, but I doubt it will solve the problem.
Next, I would check to make sure your brakes aren't dragging. Does the Jeep feel sluggish and slow to accelerate, or does it slow down pretty quickly while coasting? You could try feeling the hubs on each wheel after driving a while. If one of them is hotter than the others, you may have a stuck brake caliper. This has been known to happen on Liberties about as old as yours and mine. It happened to me with the rear brakes after changing the pads, and new calipers were the solution.
2008 Liberty Sport 4x4 Automatic
You could try taking it to Auto Zone or another auto parts store where they can check the OBDII port for stored codes. Sometimes the check engine light will take a while to come on (especially if the dealer reset it before you took your test drive), but there might be hidden stored codes in the computer that can help you diagnose a potential problem. An oxygen sensor that is going bad can make the Jeep use more fuel than it should, and there might be a stored code for something like that.
2008 Liberty Sport 4x4 Automatic
thanks for the input, I own a ELM327 OBDII connected to my phone, i used to get engine light and turned out to be bad fuel cap, I replaced and cleared the code and its gone and never come back
I will get the mech to check O2 sensor this weekend
Another thing i wonder is im not using stock tire
im running on 245/70/16 and the stock for this is 235/70/16
i wonder if that could cause any fuel consmption? not sure, i wonder if the tire is really old does that make consumption goes high ? the reason why i ask this is because i did notice on the tire it come with when i purchased states 3104, means 11 years old tire, correct me if im wrong
* changed brand new tire 235/70/16 Cooper AT/w (Balancing and Alignment done)
* Changed Oil
* Changed Oil Filter
* Brand new plugs
* Cleaned intake where mech found lot of carbon
* Installed Hypertech 52501
Last fillup up max
Now fuel gauge 1/4 = 200KM almost going to empty, probably will give me another 50-70KM
used dashcommand and monitor L/KM
It showing City = 20 l/km , Highway 12 l/KM