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Audi A3 1.6 TDI

The new Audi A3 1.6 TDI emits just 109g/km CO2 and manages 68.9mpg.

The new 1.6-litre common rail TDI engine comes with an automatic start-stop function and results in an eight per cent economy improvement over the engine powering the A3 1.9 TDIe, which it replaces. It’s available in three-door, five-door Sportback and A3 Cabriolet models priced from £17,485.

The engine has the same 105PS and 250Nm peak power and torque outputs as the larger displacement 1.9-litre TDI unit, and it can reach 62mph in 11.4 seconds and reach a top speed of 121mph.

The car has automatic start-stop and energy recuperation systems, both of which made their debuts recently in the A3 1.4 TFSI.

The start-stop system cuts engine power at idle when the clutch pedal is released and the gear lever is in its neutral position, and then restarts in just two-tenths of a second when the clutch is depressed.

Recuperation technology provides further fuel and CO2 savings by recycling a proportion of the wasted kinetic energy which is generated under normal braking and normally dissipated as heat, and storing this temporarily in the vehicle battery to reduce the engine load when the car subsequently accelerates again. With its help, fuel usage is reduced by as much as three per cent in the A3.