poor gas mileage


Asked by mom23krjs Feb 02, 2011 at 12:09 PM about the 2002 Kia Sportage Base 4WD

Question type: Maintenance & Repair

I am only getting 227 miles per tank of gas, I have no leak, on the advise of the dealership changed the thermostat (check engine light was on). Timing belt broke (caused no damage) replaced 12/9/10.  Still gas mileage is still low at 227 in warm weather i was getting 257 this issue started about 6 months ago

10 Answers


Have you checked your throtle body for carbon build up and spark plugs ? Also check tire pressure

1 out of 1 people think this is helpful.

I just had new sparkplugs put in about 15000 miles ago, new tires put on in July 2010 I have no check engine light on but was wondering if the O2 sensor possibly needs replaces as i had a Dodge shadow years ago that did the same thing and needed the O2. Dealer ship says no because the check engine light isnt on....

1 out of 1 people think this is helpful.
Chase Sutherland

this problem started around the time that winter came? winter gas doesnt do a well as "normal". its feb still. wait until april or so and the winter additives should be gone. gas mileage should improve then.

2 out of 2 people think this is helpful.

It started may or june of last year I was getting 257 this summer so the drop of 30 miles was ok due to winter but previously i was getting about 335 miles to a tank of gas this car is a 5 speed should get excellent gas mileage

3 out of 3 people think this is helpful.
Chase Sutherland

how many miles are on the car? are you in need of new spark plugs? and an O2 sensor only comes on once it reaches a certain point of failure. it can still be bad without sending out a check engine code.


100,235 miles, sparkplug replaced a little under 15,000 miles ago, thermostat changed about 99,427 due to check engine light on and that was the failure even though I had plenty of heat and the dealer told me that would affect my gas mileage....Did not help at 99,897 timimg belt snapped quietly and did not do any damage to the engine...Then dealership told me that a timing belt slipping would have affected my gas mileage, nope still the same. I did also have a problem with sudden acceleration mentioned that each visit to the dealership now they tell me that was a common sign of a slipping timing belt UGH...Done with those people and the warranty is done!

2 out of 2 people think this is helpful.

You can improve your mileage immensely if you drive it off a cliff and walk away from it all together. I owned a 2000 Sportage and have never seen a bigger money pit in my life! I've owned multiple ford work trucks, Hondas, Chryslers, Sports cars .... you name it and I've owned it. I'm telling you now to get rid of that death trap before you get sucked into the Korean vortex of constantly repairing a car that was built with the lightest duty and least durable components that I have ever seen!!!!

1 out of 1 people think this is helpful.
James Warner

with no check engine light, poor gas mileage and a sudden acceleration problem my best "guess" would be that you have a convertor coming apart. this engine is know for this and everything you have replaced are all signs of additional strain on an engine. i worked on these vehicles for 6 years before switching back to the hyundai brand completely and have seen probably 50 or more of the precats(warm up torque convertors) fail. usually followed by a cracked exhaust manifold and the car not moving at all.id suggest having the exhaust checked.

Niko-laus Arn-old

Hi, our '07 Rondo (2.7 engine) exhibits the same (!) exact issue. Used to get ok gas mileage, moved to the Gulf (no cold temperatures at all) and now gas mileage is as low as 14 miles/gallon. Talking to any KIA representation is not worth the aggravation, one might as well ask the mailman, he may even have a more cohesive answer. Something is obviously wrong, maybe the mandatory Ethanol is not helping, but 14 miles per gallon is Hummer territory. I will have yet another independent mechanic check the converter issue (thanks for the hint), but the car is paid off and selling it is not an option, the resale is not good. Ha, what a joke. Not good? It is laughable. If anybody has any idea what the Koreans missed in their design department, please let me/us all know. Tire pressure, air filter, oil and clean cabin filter ARE NOT RESPONSIBLE FOR SUCH POOR GAS MILEAGE. KIA is a car that functions best in deep storage.........

1 out of 1 people think this is helpful.
Mike Coulombe

Only answer i can give you, sadly, is that its a 2002 kia sportage... deal with it. they were terrible vehicles even new..

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