Lexus will not offer the new IS with a diesel engine, replacing it with a petrol-electric hybrid that the firm claims will emit less than 100g/km of CO2. The new car, which has been unveiled at the Detroit motor show, goes on sale in the UK this summer.

The IS will be powered by either a 2.5-litre petrol V6 in the IS 250 or a combination of a 2.5-litre four-cylinder and electric motor in the IS 300h. The hybrid system is used in the Japanese market Toyota Crown – in that car the engine produces 163lb ft and 175bhp, and the motor makes 141bhp and 221lb ft. Combined, the system produces 217bhp and Lexus is aiming for fuel consumption of over 65mpg.

Both the IS 250 and 300h are rear-wheel drive, with the 250 driving the wheels though a six-speed auto, while the hybrid uses a CVT. The front double wishbone suspension is a revised version of the last IS’s, while the rear is a multi-link system borrowed from the Lexus GS. The IS also uses the GS’s Drive Mode Select software.

F Sport models now get different styling to distinguish them from the standard IS, with a different grille and bumper. Suspension and steering are retuned, and F Sports can be had with optional Adaptive Variable Suspension. Its Drive Mode system gains a fourth setting, too.

The car is slightly wider, longer and taller than the outgoing model, with a 70mm longer wheelbase. Lexus claims this give the IS more room for rear passengers and class-leading rear knee room, while boot size has increased to 480 litres. The hybrid loses 30 litres of boot space.

The cabin design is closely related to the LF CC concept car's, with its high centre console, analogue clock, wide air vents and touch sensitive controls.

Thanks to: Autocar