Q: Fuel mileage is worse than advertised

asked by on November 02, 2015

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.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

What others are asking

Axle Bent and Cost

Sent to CS and answer made live.

Car is shutting off while driving

The first thing to do is to have the fuel cap replaced. The cap may be overtightened, causing gas tank venting to be blocked. If this gets blocked then the fuel tank can go into a vacuum and cause the...

Car is overheating and boiling water out. 2003 Hyundai Elantra

Hello - you may very well be correct. Given your symptoms, it sounds like you have a blown headgasket. This can be confirmed by checking for low compression between adjacent cylinders, white steam or smoke from the exhaust (smells sweet),...

Failure code of P0723 OSS appeared

Hey there. This relates to a faulty output speed sensor inside your transmission. This is a unit that monitors the output speed of the shaft coming out of the transmission and relays this info to the transmission control module which...

My car has a mass air flow circuit range issue

Hello. P0101 is the trouble code for an issue with the MAF sensor circuit range. This code is set when the computer detects an issue with the vehicle's MAF sensor signal. If the MAF sensor has been replaced, then it...

Should I worry about the water pump in my 2011 BMW 328i

Hello. I would not recommend changing the water pump unless there is an issue with it. It is common for the water pump to fail, but it does show signs of leakage first. ANy good mechanic can check it to...

2012 Elantra - I'm changing #4 cylinder ignition coil but i'm not sure which one it is. Anyone know the cylinder order?

The No. 1 cylinder is the cylinder nearest the engine's crankshaft pulley. The No. 4 cylinder would be nearest the other end of the engine which is the flywheel (or flexplate) "end" of the engine. If you need assistance with...

How do I unlock the car with the keys?

Your vehicle can be manually unlocked with the keys. To do so, simply insert the key into either front door lock, and rotate the key clockwise until you hear the doors unlocked. If you are using the passenger’s door, then...

Car shakes in First gear

Hello. It is possible that a tune up of your vehicle would solve this problem. There could also be a problem with one of your engine mounts. A diagnosis of the vehicle's drivability needs to be done by a certified...

Related articles

The Best Used Cars to Buy for Highway Driving
Do Do you spend hours each week on the highway for work? Maybe you just live in a very rural area and have to drive for 30 or 45 minutes to get to the grocery store. Whatever the case, your...
The Best Used Cars to Buy If You Get Motion Sickness
For For people that suffer from motion sickness, even on the shortest car trip, riding in a vehicle can prove to be unbearable. What’s great is that there are a number of cars on the market that can help to...
A Buyer’s Guide to the 2011 Mazda Tribute
2011 2011 marked the final year of production for the Mazda Tribute, a compact SUV that shared a platform with certain Ford models. The Tribute managed to combine relative affordability with decent performance and a modicum of comfort while driving...