What do I do?

Asked by Jan 20, 2016 at 11:59 PM about the 2014 Kia Forte LX

Question type: Maintenance & Repair

I have a 2014 KIA forte sedan lx automatic. I purchased it
brand new in 2013. Since then I have always gotten 25 city
and around 37 highway. Until December of 2015, I noticed
the gas mileage started to dip in November, and I had been
driving and hour to school and back every other day. So I
thought it was the tires. I got new tires, futura I believe. I
read good reviews about them so I was swung. I got them
and I noticed my milage still wasn't what it used to be. I
also noticed that on a long trip, about an 8 hour drive, I
wasn't able to keep my speed steady on the highway as I
have always been able to do so. I also notice a bit more
shaking then I would let me when sitting still in the car. I
am thinking it isn't the tires at all. I recently read something
to make me think it is the spark plugs but I only have 23k
miles on the car. I also keep up with all the scheduled
maintenance. What do I do? I need that gas mileage back!
Dx

1 Answer

71,615

Depending on when in 2013 you purchased it you may still be covered by the new car warranty. Check your warranty booklet. It could very well be a defective spark plug or ignition coil. That would give you a rough idle. As well as a dirty air filter or possibly a small vacuum leak. The air filter should be changed especially if it's original. The maintenance interval on that is every 30 months or 30,000 miles whichever comes first. Normal maintenance items such as the air filter for example aren't covered by warranty. But things like the ignition coil(s) and spark plugs should be. If you are still in warranty I'd suggest letting your local Kia Dealer look at it. As a comparison when my '93 Chevy Caprice was new I got 20 MPG. Nineteen years and 130,000 miles later it was getting 18 MPG. As a vehicle ages the gas mileage will drop off a little. But nothing too drastic unless something is going on. HTH. -Jim

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