Citroen's new C3 is the car maker's cleanest diesel yet, with CO2 emissions of just 87g/km and average economy of 83.1mpg.
The C3 e-HDi 70 Airdream EGS VTR+ uses Citroen's e-HDi micro-hybrid stop-start technology combined with a 68bhp HDi diesel engine.
Its sub-100g/km emissions figures mean it will attract zero road tax, and be exempt from the London Congestion Charge.
Business users will also benefit, with company car tax at just 13%.
The car was revealed at the Frankfurt motor show in September and is available to order now for 15,290.
Citroen cleans up
Citroen claims that 50% of all its models sold this year have emissions of less than 130g/km. Meanwhile, there has been a 5% decrease in emissions for the car maker's range as whole.