Drivers, governmental agencies and original equipment manufacturers continue to be frustrated by the difference between the mileage figures shown on new-vehicle window stickers, which are based on U.S. Environmental Protection Agency testing protocols, and the cars' real-world fuel consumption. A case in point: In early November, EPA announced it had found discrepancies in the fuel economy claims for more than 900,000 Hyundais and Kias - about one-third of units sold in the United States since 2010. The sister brands had overstated their miles per gallon by about 3 percent, and had to relabel all of their 2012 and 2013 models. Hyundai knocked down most by 1 or 2 mpg, but took a 6 mpg whack at the Kia Soul's rating.
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