A4 allroad quattro Saving You Fuel

TDIe
Power and economy

Diesel engines and performance cars never really used to click. But then Audi's TDI powered Le Mans-winning race cars changed the way the world looked at diesel power.

The Audi A4 allroad comes with a choice of a petrol and two diesel engines. The entry level 2.0 TDI delivers 170 PS enabling the car to complete 0-62mph in a brisk 8.9 seconds. But thanks to Le Mans-winning TDI technology, fuel consumption is 45.2mpg and CO2 emissions a meagre 164 g/km.

Recuperation

When you're coasting or braking, the car's alternator generates electricity. Recuperation allows it to be stored so when you're accelerating or driving at a constant speed, the stored electricity is used to drive the alternator. Recuperation reduces fuel consumption by up to 3% and therefore lowers CO2 emissions.

S tronic
Smooth gear changes, lower fuel consumption

The revolutionary S tronic transmission combines the responsiveness of a manual gearbox with the convenience of an automatic. Thanks to innovative dual-clutch technology, S tronic can make a gear change in just 0.2 of a second, with no interruption to the power flow, allowing you to benefit as fully as possible from the engine's output at all times, resulting in better fuel efficiency and lower CO2 emissions.

Aerodynamics
Sleek design for greater efficiency

Aerodynamic performance is critical for reducing fuel consumption and raising efficiency. Audi prototypes spend over 1,000 hours in a wind tunnel with improvements being made so drag can be reduced. Less air resistance also means improved handling, lower CO2 emissions and even improved safety. Improvements such as door mirrors which are aerodynamically shaped so rain is directed away from the side windows for better all-round visibility is another notable product of this extensive development process.

After rigorously testing and fine tuning the Audi A6, the 2.0 TDIe achieved a remarkably low drag co-efficient of jut 0.28.