EPA Finds Hyundai, Kia Overstated Gas Mileage Hyundai and Kia overstated the gas mileage on most of their models from the past three years in an embarrassing blunder that could bring sanctions from the U.S. government and millions of dollars in payments to car owners. Because of the inflated mileage, discovered during an audit by the Environmental Protection Agency, the Korean automakers must retrofit the window stickers on the cars, reducing their fuel economy figures by one-to-six miles per gallon depending on the model, the agency said Friday. "Consumers rely on the window sticker to help make informed choices about the cars they buy," said Gina McCarthy, assistant administrator of the EPA's air-quality office. EPA's investigation will help protect consumers and ensure a level playing field among automakers. The EPA said its inquiry into the errors is continuing, and the agency would not comment when asked if the companies will be fined or if a criminal investigation is under way. But the EPA said it's the first case in which erroneous test results were uncovered in a large number of vehicles from the same manufacturer. Only two similar errors have been discovered since 2000, and those involved single models. In this Thursday, Oct. 4, 2012, photo, a Hyundai Elantra is seen inside of a Hyundai car dealership in Des Planines, Ill. Major automakers are reporting Thursday, Nov. 1, 2012, that sales increased for October despite losing three days of business to the punishing rain and wind from superstorm Sandy. (AP Photo/Nam Y. Huh) Close Hyundai and Kia executives apologized for the errors, said they were unintentional, and promised to pay the owners of 900,000 cars and SUVs for the difference in mileage. The payments, which will be made annually for as long as people own their cars, are likely to cost the companies hundreds of millions of dollars. The EPA said it received about a dozen complaints from consumers that the mileage of their 2012 Hyundai Elantra compact cars didn't match the numbers on the window stickers. So staffers at the EPA's vehicle and fuel emission laboratory in Ann Arbor, Mich., included the Elantra in an annual audit that focused on cars that lead their market segments in mileage. 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.