General Motors says it overstated the fuel economy for three crossovers by 1 to 2 miles per gallon, but says it was a mistake, not an intent to deceive customers.
The "inadvertent error" means GM overestimated the fuel economy of 170,000 2016 Chevy Traverse, GMC Acadia, and Buick Enclave vehicles by about 10%.
GM says the mistake happened when it installed new emissions-related hardware in the cars. New mileage stickers have been issued, and owners are being notified.
The automaker hasn't yet announced if it will compensate owners for the difference in gasoline costs.
A much worse scandal involving deliberate fraud has recently hit Mitsubishi of Japan. The company is accused of overestimating fuel economy by as much as 15% in many cars.
