Hyundai and Kia are facing a second lawsuit of its inflated fuel economy figures.

Hyundai and Kia's mileage woes continue as the corporate partners have been hit with a second U.S. lawsuit seeking up to $775 million. Earlier this week Hyundai and Kia were slapped with a lawsuit on behalf of roughly 900,000 owners in U.S. District Court for the Southern District of Ohio.

As with the first suit, the second lawsuit against Hyundai and Kia is seeking damages stemming the from the automakers' inaccurate fuel economy ratings. Hyundai and Kia inflated fuel economy ratings on 35 percent of its vehicles from the 2011-13 model years, or about 900,000 cars.

The latest suit, filed in Los Angeles, claims the "Plaintiffs and the Class have been damaged by Hyundai's and Kia's misrepresentations, concealment, and non-disclosure of the incorrect fuel economy numbers, because they were misled into purchasing Hyundais and Kias of a quality different than they were promised, and paying higher fuel costs they would not otherwise have paid."

The suit is currently seeking a class-action designation, according to Automotive News.

Hyundai and Kia have already agreed to refund the difference in gas bills to owners of vehicle included in the suit, which will cost the automakers an estimated $362 million. With the two lawsuits piled on top of that figure, the automaker's losses from its miscalculations could easily stretch into the billions of dollars.