The hybrid Mercedes-Benz E300 BlueTec will be revealed at the Detroit Motor Show.
The E300, and its petrol twin, the US-only E400, will be revealed at the Detroit show next month.
The headline CO2 figure of 109g/km will make the E300 BlueTec popular with company car users. It undercuts BMW’s petrol-powered Active5 Hybrid by a significant 40g/km.
The 201bhp/369lb ft diesel engine is mated to a 27bhp/184lb ft brushless electric motor sited within the gearbox housing. A 0.8kWh lithium ion battery is said to provide an all-electric range of less than a mile at speeds below 35mph. Together, they are claimed to provide the E300 with a 0-62mph time of 7.5sec and a top speed of 150mph.