Hyundai, Kia Mileage Mishap: How It Happened

How did Hyundai-Kia get its estimated mileage ratings so wrong that it had to offer reimbursement to some 900,000 owners? The truth is complicated, and it gets to the complexities of EPA testing.

Hyundai-Kia's Sung Hwan Cho told reporters this morning that it's "a very complex testing process." Cho heads the automaker's U.S. technical centers. He shed some light on the EPA tests, which lead to the city and highway fuel-economy figures on a new-car window sticker. A key part of the tests involve measuring the resistance of various systems, dubbed the "road load" by engineers: how a car's tires meet the pavement, how the vehicle's shape cuts through the air and how the drivetrain's moving parts work in tandem. Each area translates to fuel efficiency, or lack thereof.

"There are hundreds of different parameters that can affect this road load," Cho said. "Ambient temperature, wind speeds, atmospheric pressure."

Then there's a litany of variations within each test vehicle — how many miles are on it, the condition of the drivetrain, the tire wear. Finally, the test procedures themselves involve "which kind of regulation and guidance procedures you follow, and how you process the data, and how you calibrate your measurements," he said.

Somewhere in those variations, Hyundai-Kia went askew of EPA guidance. But exactly how much guidance exists is up in the air.

Room for Interpretation?
"We added a few more stops and processes, which is different from what the EPA recommended," Cho said. The EPA process is rigid, "but there are also some points where we need some interpretation."

"This test is extremely complicated and delicate and sensitive," he said. "We have been introducing many different models of vehicles to the market over the past three or four years, so we need to handle various types of models within limited amounts of time. So that's made us improve the efficiency of the test itself — how you efficiently make the test and generate the results. By doing that … we added a little [sic] more steps."

An example: Hyundai-Kia used a test track instead of simulated public roads to break in its tires before testing, Cho said. That reflected inaccurate road resistance, the Detroit News reports. Hyundai-Kia changed its test procedures to reflect these calibrations in 2010, but the EPA's Ann Arbor, Mich., National Vehicle and Fuel Emission Laboratory observed discrepancies early this year. That led the agency to investigate. Not long after, a consumer watchdog group pressed claims that the automaker's Elantra sedan didn't get anywhere near its 40 mpg EPA highway rating.

By fall, the EPA had hinted at additional measures.

"We are meeting with [automakers] and testing vehicles to confirm that across the industry the road-load estimates provided to the agency are accurate and consistent," the EPA's Office of Transportation and Air Quality stated in a presentation at September's International Environmentally Friendly Vehicle Conference. The EPA surveys vehicles between 20,000 and 90,000 miles, but automakers perform compliance testing at various points throughout a 120,000-mile lifecycle.
"Nobody is trying to con anyone," Andrew Smart, director of industry relations at the Society of Automotive Engineers, told "What you're trying to do as engineers is [create] repeatability … If there are any subtle differences in vehicle configuration, it's those that are measured and not the driving conditions of the track."
Closing the Gap
It remains to be seen how the EPA will address the gap in testing standards, or if it’ll simply audit more cars. The agency currently audits about 15% of car models in a given year. Two EPA spokespeople did not immediately return requests for comment, but steps will be taken if the agency's record is any indication.
"Manufacturers expect regulatory agencies to implement and enforce their programs in a way that ensures a fair and level playing field for all participants," according to the EPA's September presentation. "If a competitor evades an emissions regulation, they will not only realize a cost savings, but they will likely be able to offer product at a price point that gains sales that should have gone to other parties in the market."
The presentation noted that the EPA should ensure that manufacturers don't "defeat or circumvent regulations through elements of design or control."
The EPA could impose civil penalties on Hyundai-Kia, the Detroit News said; Hyundai Motor America President John Krafcik told the newspaper the automaker will fully cooperate. But SAE's Smart maintains the automaker wasn't willfully negligent.
"I think in this occasion, very clearly, they never tried to mislead people" Smart said. "There will be an internal review of what happened. … What will happen is more data will be required, more definition will be required. It all comes down to more."

In the meantime, the rest of the industry — particularly carmakers with sky-high EPA ratings — will take notice. Hyundai's travails could result in higher oversight for mileage ratings not just from the EPA, but from within the industry.

Automakers "don't want to be affected by this, and therefore they will pay very, very close attention," Smart said. "This will be a wake-up call for other people that you cannot be complacent. … The [automakers] are very cognizant of what's being said out there of their own product."

Hyundai, Kia to Pay 900,000 Owners for Bad MPG Estimates
What to Do If You Own an Affected Hyundai, Kia's Mileage Tests of Hyundai and Kia Vehicles in Line With EPA Results


Anonymous Guy

They are willing to admit their mistake. Good enough.


If they aren't smart enough to test the cars in accordance with the EPA guidelines, what else is suspect in their vehicles?


Funny, everyone else seemed to figure it out. Why is Hyundai the only one for whom it is too complicated to understand?

What else about cars do they not understand?


The EPA comes up with these really stupid fuel consumption numbers which are based on "simulated calculations" as opposed to real driving. The EPA forces the manufacturers to put these contrived figures on the sticker and then it's the manufacturer's fault that the numbers are wrong? Hyundai is not alone with this problem. Typical government.

j traveler

not just Hyundai-Kia are at fault. The EPA are the ones who approve those mileage figures and this is fairly not new it happened to finally surface. almost every automaker should join the league of misprint fuel ratings. its takes just a hand full of complaints and there goes that "inconvenience" payback. these two thriving companies are indeed revisiting engineering school to actually deliver those numbers not way under which is sad its gonna affect the brands image in which they threw effort into these last few years that made them considered among the top sellers. patch and repair asap.


It still boils down to how drivers drive..... I own a 2012 Azera and have no problems doing better then EPA ratings


this isn't the first time hyundai/kia has been caught fibbing about their vehicles' performance. just a couple years ago, they were caught inflating the HP numbers for their engines.

i was fairly certain this was coming for the mpg ratings. in the annual tests i've read on the hyundai elantra, the average fuel economy has been mid-20s. their hybrids and crossovers have come up short as well. i understand not meeting the fuel economy ratings when motortrend or car and driver are wringing the cars out for testing, but in an annaul test with 20+ thousand miles, the car should easily achieve the epa rating.


"I think in this occasion, very clearly, they never tried to mislead people" Smart said.

I don't believe that for a second. They needed to make a splash, and 40 mpg was the ticket.

Vickie Neal

Bought a 2013 Kia Sorento 4DR, 2WD LX back in June 2012. Has 14,900 miles on it. Has never got close to upper projectiles for fuel mileage averages. Will not buy another Kia for this reason. Should've stayed with Nissan....

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