Skip the auto shop - Our mechanics make house calls

Q: Bad gas mileage on the highway

asked by on

Hi. My car has 160,000 miles on it and bad gas mileage. As I've been told, this vehicle should get 20 miles per gallon on the highway. Mine was getting 16 so I had the plugs replaced, thinking that would improve the gas mileage. But it didn't and now I get 12 mpg on the highway. How can I imporve the gas mileage? Do you have any advice? Thanks.

A: There are many things that can cause the fu...

There are many things that can cause the fuel mileage to go down or be lower than what others are getting. The most important thing is to not use performance parts like filters or sensors. These only increase the power and use more gas. Also, put the tires to their most optimal pressure settings. Make sure all tune-up parts are new like the plugs, filters, wires, and belts. Then practice good driving habits like coasting longer before stoping, accelerating slower, and braking slower. Not speeding will also save fuel. Do not use A/C unless it is needed. All these things will help. Finally, you can have the computer scanned for any pre-existing problems that may affect fuel mileage.

Was this answer helpful?
Recommended services
Get a Quote

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・Fair and transparent pricing

Get a quote

What others are asking

Q: car runs hot at red lights

Hey there, thanks for writing in about your 2005 Chevrolet Impala. You need to verify the cooling fan is cycling on to control the temperature of the engine. The fan motor may not be coming on. Have a mechanic diagnose...

Q: Why do I continue to have a burning oil and fuel smell in my 2009 Dodge Charger

Hello. This can be caused by a number of things. If you continue to have leaks in the engine then there may be too much pressure built up in the engine. This is usually caused by excessive blow by due...

Q: Car will not shift gears, stuck in neutral.

Hello - your symptoms suggest a failure or disconnect of the shifter linkage to the transmission (whether cable or mechanical linkage). Most likely, this is external to the transmission, and can be repaired without having to get inside the transmission....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.