Start-stop. The start-stop system shuts down the engine once the car has come to a stop, the gear lever stands at idle and the driver releases the clutch pedal. Operating the clutch then starts up the engine again. The start-stop system is quiet, convenient to operate, and fast—the engine returns to idle speed while the driver is shifting gears.

Audi combines the start-stop system with efficient battery technology and energy management to maintain functioning even at low temperatures. The system is inactive during the warm-up phase of the engine, so that the engine oil becomes warmer and the exhaust gas cleaning systems reach their operating temperature faster. The driver can also switch off the start-stop system at any time by pressing a button.

In the standardized driving cycle, the start-stop system lowers fuel consumption by about 0.2 liters per 100 km, and therefore reduces CO₂ emissions by around 5 g/km. The new system is being used for the first time in the Audi A3 1.4 TFSI with manual transmission and in the Audi A4 and A5 with two-liter engines and manual gearshift. Other models will follow this year.

On-board computer with efficiency program. The second newcomer in the modular efficiency platform is the on-board computer with the efficiency program, an addition to the Audi Driver Information System. All consumption-related data appear in the center display, with recommendations for efficient driving&madsh;up to 30% of fuel consumption depends on the individual driving style, according to Audi.

The efficiency program continuously analyzes the energy consumption in the vehicle and gives the driver up-to-date tips for saving fuel, depending on the driving situation and driving style.

The newly designed gearshift indicator signals to the driver when to shift, for optimal fuel economy: A large and color-coded display indicates whether the right gear is engaged, or whether shifting would be practical for the sake of efficiency. Comfort features like air conditioning and seat heating also increase fuel consumption. A specially developed display in the efficiency program identifies the systems requiring extra energy and indicates their share in fuel consumption.

Energy recovery system. The energy recovery system already uses deceleration phases to convert kinetic energy into electrical energy. When the car accelerates again, the battery directs the temporarily stored energy back into the vehicle, to relieve the alternator and thereby save fuel. The energy recovery system is already standard equipment on the Audi A3 1.4 TFSI with manual transmission, the Audi A4, A5 Coupé and A5 Cabriolet with two-liter engine and manual transmission, the A6 and the Audi Q5 and Q7.