The new Nissan Micra DIG-S, with its supercharged petrol engine, emits just 95 g/km CO2.
Known as the DIG-S, the engine is a direct injection unit with a supercharger ? hence the car’s name: Direct Injection Gasoline-Supercharger. It delivers good performance and economy, and low emissions.
The DIG-S uses the Miller cycle and direct petrol injection to raise the compression ratio to 13 to 1 for greater combustion efficiency, and a supercharger for instant throttle response and added power. As well as delivering ultra-low CO2 emissions, the lightweight, low-friction 1,198cc three-cylinder unit produces the power expected from a conventional 1.5-litre four-cylinder engine.
The DIG-S engine produces 72kW (98PS) and 142Nm, while CO2 emissions are 95 g/km for the manual version and 115 g/km for the CVT version. Maximum speed is 112 mph for manual and the combined cycle fuel economy figure for the manual Visia version is 68.9 mpg.
By minimising heat, friction and pumping losses as much as possible, its three-cylinder configuration gives many benefits including less weight and further reductions in friction loss, thanks to having fewer moving parts. Further gains are made thanks to the adoption of advanced engine management systems with Start/Stop and energy regeneration.
Of course the Micra DIG-S will be exempt from the London congestion charge, as well as being exempt from road tax.
The figures quoted are for the entry-level version; the higher spec Acenta still emits just 99 g/km CO2.
The DIG-S will be given its European debut at the Geneva Motor Show (March 3-13) with sales starting over the summer.