A probe done by the US-based Environmental Protection Agency (EPA) has concluded that Hyundai and Kia have both been found guilty of exaggerating a majority of their vehicle's fuel economy claims for the 2012 and 2013 model years. Apparently, the EPA estimates that this practice has been done since late 2010. As such, both of these Korean automakers will compensate the owners of some 900,000 vehicles sold under the now false claims.

Before the EPA probe, Hyundai aggressively marketed their Accent, Veloster, and Elantra vehicles to have boasted up to 40 mpg (17.00 km/L) on the highway. Now, these vehicles will see their ratings drop to anywhere between 37-38 mpg (15.73-16.15 km/L). The largest adjustment will be on the Kia Soul which will a reduction of 6 mpg (2.55 km/L). All in all, about 35 percent of 2011-2013 models will see a reduction in EPA fuel mileage in one way or the other.

Hyundai said that the erroneous fuel mileage readings is due to "honest mistakes" because of "procedural errors". As such, the company will compensate some 900,000 owners based on their vehicle's odometer readings which includes an additional 15 percent taking into account the US Dollar's value. The funds will be awarded via a prepaid debit card.