Citroen’s DS5 Hybrid4 is now more efficient than ever thanks to technical improvements and new management software for the diesel-electric drivetrain.
The 200-horsepower combination of a 2.0-litre diesel engine and a modest electric motor now emits as little as 91g/km of CO2 when combined with Citroen’s Airdream EGS6 automated manual gearbox.
As before, the higher-spec models with larger wheels and more equipment do record slightly worse efficiency scores. While entry-level DSign cars hit the 91g/km marker and sit in the 10% benefit-in-kind tax band, DStyle and DSport versions have dropped from 107g/km to 102g/km, narrowly missing out on the threshold for free road tax.
However, the mid-range and flagship DS5s do drop one band in the benefit in kind stakes, falling from 12% to 11%.
In a handy twist, though, 17-inch alloy wheels are available as a no-cost option on the 11% models, instantly reducing their CO2 output to 91g/km and allowing them to qualify for free road tax and 10% company car tax liability.
Potential fuel economy has increased as well, and although no figures have been confirmed by Citroen, around a 3-5% improvement is realistic.
Among the key technical enhancements for the revised drivetrain are improved energy recovery when decelerating and braking, and a new battery management system.
The more efficient DS5 is available now, with prices starting from £27,600 on the road.