Not convinced?

Ryan Borroff

Audi A4 2.0 TDIe, from £26,880
Emitting a paltry 112g of CO2 while returning 65.7mpg, Audi’s ultra efficient A4 2.0 TDIe model makes a compelling case for diesel power. Zero to 62mph takes 9.3 seconds and top speed is 134mph. Inside it’s the same familiar Audi recipe in terms of comfort and controls, though the ride is harder than that of some competitor cars. Its cold design perfection may leave some people craving more emotional engagement.

BMW 320d Efficient Dynamics, from £28,410
Possibly the best saloon car on sale, the 320d Efficient Dynamics has hit the sweet spot in balancing economy, emissions and performance – as its popularity shows. Zero to 62mph can be dispatched in 7.7 seconds and a top speed of 143mph is possible yet this 3 Series is capable of 68.9mpg with CO2 emissions of 109g/km. Engaging to drive, it rides and handles well, is comfortable and has a sizeable boot.

Mercedes-Benz C220CDI Blue Efficiency, £28,660
Petrol-hybrid sales may be on the rise but Mercedes-Benz is proving there is still plenty of economy to be squeezed out of a combustion engine. This C220CDI model is fitted with Mercedes Blue Efficiency technology to eek out every last ounce of fuel efficiency, yet it can accelerate from 0-62mph in 8.4 seconds and on to a maximum speed of 144mph. It emits less than 109g/km of CO2 and return 68.9mpg.