Procedural errors at Hyundai’s testing operations in Korea led to incorrect fuel economy ratings for select vehicle lines.
The MPG rating discrepancies resulted from procedural errors during a process called “coastdown” testing. Countdown testing measures a vehicle’s aerodynamic drag, tire rolling resistance and drivetrain frictional losses, and provides the technical data used to program the dynamometers that generate EPA fuel economy ratings.
For more information on coast-down testing, please click here.