BMW’s 1 Series has a number of models dipping under the 130g/km mark, including most 120d and 118d models thanks to EfficientDynamics technology which includes stop-start, brakeforce regeneration and gearshift indicator. Its combination of power (177bhp for the 120d) and economy is unmatched.

Audi launches an ultra-economical A3 in September which promises fuel economy of more than 60mpg and CO2 emissions of less than 120g/km, thanks to a remapped engine and revised gear ratios. Called the A3 1.9 TDIe, it is claimed to achieve fuel economy of 62.7mpg.

Volvo will introduce a specially modified C30 model next year which reduces CO2 emissions to below 120g/km.

The C30 Efficiency uses a revised version of the 105bhp 1.6-litre diesel engine, as well as improved aerodynamics, revised gearing and low rolling-resistance tyres.

Fuel economy will rise to 62.8mpg.