The audit turned up discrepancies between agency test results and data turned in by Hyundai and Kia, the EPA said. As a result, the automakers will have to knock one or two miles per gallon off the mileage posted on most of the models' window stickers. Some models will lose three or four miles per gallon, and the Kia Soul, a funky-looking boxy small SUV, will lose six mpg from the highway mileage on its stickers.
Hyundai and Kia are owned by the same company and share factories and research, but they sell different vehicles and market them separately. The companies said the mistakes stemmed from procedural differences between their mileage tests and those performed by the EPA.
"We're just extremely sorry about these errors," said John Krafcik, Hyundai's CEO of American operations. "We're driven to make this right."
The changes affect 13 models from the 2011 through 2013 model years, including seven Hyundais and six Kias. Window stickers will have to be changed on some versions of Hyundai's Elantra, Sonata Hybrid, Accent, Azera, Genesis, Tucson, Veloster and Santa Fe models, as well as the Kia Sorrento, Rio, Soul, Sportage and Optima Hybrid.
Michael Sprague, executive vice president of marketing for Kia Motors America, also apologized and said the companies have a program in place to reimburse customers for the difference between the mileage on the window stickers and the numbers from the EPA tests.
The companies will find out how many miles the cars have been driven, find the mileage difference and calculate how much more fuel the customer used based on average regional fuel prices and combined city-highway mileage. Customers also would get a 15 percent premium for the inconvenience, and the payments would be made with debit cards, Sprague said. The owner of a car in Florida with a one mpg difference who drove 15,000 miles would get would get a debit card for $88.03 that can be refreshed every year as long as the person owns the car, Sprague said.