Audi has redeveloped its 1.6 TDI diesel engine in its A3 model getting carbon dioxide emissions down to 99g/km and the extending its efficiency to 74.3mpg.

The new engine is only available on the three door body style equipped to standard specification priced at £18,005. Order books are open now.

Audi said it achieved the efficiency improvements by modifying the drive ratio for the five-speed manual gearbox, reducing the ride height, improved aerodynamics, smaller 15-inch alloy wheels and low rolling resistance tyres. The new model is also fitted with a start-stop engine and regenerative braking system to help save on fuel.