Q: Fuel mileage is worse than advertised

asked by on

At only 30,000 miles, I'm noticing that my 2011 Hyundai Elantra is not getting the kind of fuel economy which Hyundai promised in the information given to me before buying this car. The dealership has offered to reimburse me a small amount via a debit card for fuel, but I just want the good fuel economy I was promised! Is there anything I can do to improve the mileage my car gets? My commute is very far and paying for all this gas is hitting me financially hard.

Fuel economy has many influences on it which can raise or lower the MPG. Are you calculating the fuel economy figure per tank or off the trip computer? The trip computer is a constant average that might be resettable (see owner manual). If so, reset it on your next long highway trip to see what it reads. When you are idling for any period of time, this will cause a drop in fuel economy. Fuel economy will also be reduced by speed, acceleration, poor tire psi and condition, the load inside the car, weather, and terrain. For example, driving 20 miles to work up a hill and never getting above 30 MPH will lower fuel economy. Highway mileage, in theory, means cruising at 60 MPH and during that time you will be close to what the rated MPG is. The EPA Fuel economy is measured under controlled conditions in a laboratory using a standardized test procedure specified by federal law. Manufacturers test their own vehicles—usually pre-production prototypes—and report the results to EPA. EPA reviews the results and confirms about 10%–15% of them through their own tests at the National Vehicles and Fuel Emissions Laboratory.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Fuel mileage is worse than advertised

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: Issues with coolant pouring out of the overflow

Hi there. If the engine is losing coolant, then the location of the leak needs to be found first. A leak will allow the coolant to get low enough to cause it to overheat. I start by doing a pressure...

Q: My car has a misfire, poor acceleration, and poor fuel burn (all the coils are good)

Hello and thanks for your question. Check the condition of the spark plugs to see if they are fouled out. If the spark plugs are in good shape, then unplug one injector at a time from the harness while the...

Q: My transmission is sticking in 3rd gear.

Hello, thanks for writing in to YourMechanic. This behavior is a known problem with your Hyundai Elantra, and involves a transmission control solenoid that is malfunctioning. Check with your Hyundai dealer for Technical Service Bulletin 286947. If you'd like a...

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
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.