Hyundai releases details on the new Sonata Hybrid, a model which gets few significant improvements under the bonnet, tweaks able to boost the performance.

To be more specific, the Japanese model is powered now by a 2.4-liter four-cylinder unit and a 35 kW electric motor.

2013 Hyundai Sonata Hybrid
2013 Hyundai Sonata Hybrid

It also features a new 10.5 kW Hybrid Starter Generator and a new regenerative braking system. Thanks to these upgrades, the new Hyundai Sonata Hybrid returns a fuel economy of 36mpg (city) and 40mpg (highway).

The boot capacity is also increased from 303 liters to 343 liters thanks to the new lithium-ion battery pack which is both smaller and better.

“The 2013 Hyundai Sonata Hybrid increases fuel efficiency and operates in all-electric mode more often and for longer periods of time,” adds the company.

The new Sonata Hybrid starts at $25,650 in the States (excluding the destination fee) and is scheduled to hit the showrooms soon.