Nearly every single model sold by Mitsubishi is now being investigated by authorities in Japan.
When first revealing the lies, the company said managers at the company were under intense pressure to keep pace with fuel economy rates reported by its competitors.
The company says it used a specific procedure to calculate efficiency that did not comply with Japanese law.
Officials at Mitsubishi apologized in a statement, saying that “drastic reforms” are being chosen to ensure that the same type of mileage issues do not occur in the future.
While the company says the affected cars were all sold in Japan, regulators in the US have asked that the company also investigate its American sold vehicles to ensure full compliance.
Hundreds of thousands of vehicles are affected by the cheating scandal.
Markets have reacted by removing 40% of the automobile manufacturers market value since April.
This isn’t the first time a company has been punished for cheating on its fuel mileage numbers.
Korean carmakers Hyundai and Kia agreed to pay a combined $100 million fine in the US in 2014. They also paid customers a refund for the difference in fuel mileage.
Ford also agreed to refund customers over 200,000 US that overstated their gas mileage.