(Hyundai)

South Korean automakers Hyundai Motor America and Kia Motors America overstated the fuel economy on nearly a million late model vehicles and will issue owners special debit cards to reimburse the extra money they are paying for fuel.

The error was announced Friday by the U.S. Environmental Protection Agency, which monitors the fuel economy tests by automakers.

The mileage on most vehicle labels will be reduced by 1 to 2 miles per gallon, and the largest adjustment will be 6 mpg highway for the Kia Soul, federal regulators said. Both automakers will place new labels reflecting the corrected mileage estimates on cars currently at dealers.