Skip the auto shop - Our mechanics make house calls

Q: Car getting low gas mileage

asked by on

Going to work round trip, I have to drive all the way on the highway for 46 miles. I go around 13 miles at 70 mph and at 55 mph I go about 10 miles. My car, recently purchased used, has approx. 92,000 miles. It was previously owned by a rental company and recently had been turned in. The gas gauge is moving very quickly. Perhaps it is reading correctly and I'm just not accustomed to it, but I think I’m using at least nearly a quarter of a tank of gas to go these 46 miles. That calculates to about 250 miles per tank. That is only 16 mpg with my 15-gallon gas tank. I read that this car is 25 mpg highway and 18 mpg city, with a combined average of 20 mpg. I'm very puzzled why I'm getting such bad gas mileage. Should I change the air filter or what can I do to fix my vehicle?

A: Yes, 16 mpg is very low for a Kia Rondo, es...

Yes, 16 mpg is very low for a Kia Rondo, especially with the amount of highway driving you do daily. Start with basics like the air filter and tire pressure, which are two big items that will rob you of fuel economy.

The parking brake adjustment should be checked as a dragging parking brake which will kill gas mileage. One last thing to look at would be having the faults read out of the engine computer.

If there are faults preventing the computer from going into an open loop operation, the engine computer might stay in a preprogrammed closed loop and not meter the fuel as efficiently as it could for driving conditions. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the expertise to examine the decreased gas mileage that the vehicle is exhibiting and recommend corrections to get the fuel economy back where it belongs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Belt, pump, and gauge problems

Hello! There is likely an issue wth the oil pressure sensor causing the flashing Oil Light. I suggest having a technician test the sensor by the use of a multimeter. Also, be sure to have the oil level checked; a...

Q: Can't open door from outside

Generally, the outer door handle itself is the issue. You will want to get this repaired as soon as possible; if someone hits the child lock switch, you will not be able to open the door at all. You may...

Q: Truck won't start.

You will need to check the power resistor wires to the starter relay to see if they were burned in two. This is the most likely cause when the starter is shorted.

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...