Hugh Pickens writes writes "Reuters reports that Hyundai and its affiliate Kia Motors conceded that they overstated the fuel economy on more than 1 million recently sold vehicles, and agreed to compensate owners for the additional fuel costs after the EPA found the errors in 13 Kia and Hyundai models from the 2011 to 2013 model years. The findings were a blow to the two carmakers who have centered their marketing campaigns on superior fuel economy. "Given the importance of fuel efficiency for all us, we are extremely sorry for these errors," says John Krafcik, head of Hyundai Motor America. "When we say to Hyundai owners, 'We've got your back,' that's an assurance we don't take lightly." The mileage on most labels will be reduced by 1 to 2 miles per gallon, with the largest adjustment being a 6-mpg highway reduction for one version of the Kia Soul, the EPA said. Hyundai previously touted the fact that many of its models get 40 miles per gallon on the highway. Now three Hyundai models, the Elantra, Accent and Veloster, as well as the Kia Rio fall short of that mark as will the Hyundai Sonata and Kia Optima hybrids. "The fact that the companies' ballyhooed 40 mpg cars are no longer members of that august club...will be something that haunts the companies for a long time to come," says Edmunds car editor John O'Dell."