DETROIT – Hyundai reveals two new additions to its Sonata midsize-sedan lineup here today at the 2015 North American International Auto Show.

The first is a next-generation version of the Sonata Hybrid, which Hyundai says delivers 10% better fuel economy than the ’15 model, at 42 mpg (5.6 L/100 km) in combined driving, thanks to upgraded powertrain components including a more powerful electric motor and a larger lithium-ion battery pack.

The ’16 Sonata Hybrid’s electric motor is a 38-kW (51-hp) unit, compared with a 35-kW (47-hp) motor in the outgoing Sonata Hybrid. The car has a 1.62-kWh Li-ion pack, 13% more capacity than the 1.43-kWh pack in the ’15 hybrid sedan.

The larger motor and battery pack allows Hyundai to downsize the hybrid’s engine. The ’16 Sonata Hybrid has a 2.0L gasoline-direct-injected 4-cyl., which makes 154 hp and 140 lb.-ft. (190 Nm) of torque.

A 2.4L multiport-injected 4-cyl. was used in the ’15 Sonata Hybrid, generating 159 hp and 154 lb.-ft. (209 Nm) of torque.

Total system horsepower in the ’16 Sonata Hybrid is 193, down from 199 in the ’15 model.

As in the old Sonata Hybrid, the new model has a clutch in lieu of a torque converter, pairing the engine to the drivetrain. The automaker claims the car can travel on electric power alone up to 75 mph (121 km/h) by decoupling the engine from the drivetrain.

Hyundai updates the car’s 6-speed automatic transmission with an electric oil pump.

Packaging efficiencies achieved with the new hybrid include a flat trunk floor. In the old model, the pack intruded on trunk space. The achievement gives the car best-in-class passenger volume, Hyundai says, also touting best-in-class cargo volume of 13.3 cu.-ft. (377 L), a 10% rise over the ’15 Sonata Hybrid.