The government on Monday gave official confirmation to record fuel efficiency figures for the hybrid version of Hyundai's new Sonata, which is due to be released this month.

The car will be the first mid-sized hybrid sedan in the Korean market with a mileage of over 20 km per liter at 20.1 km/l. Competing mid-sized hybrid sedans manage at best 17 to 18 km per liter.

It is also the first Hyundai with the optional trim of a solar panel roof, which the carmaker says will make it even more fuel-efficient.

