Audi redefines fuel efficiency with this new variant of the A3 hatchback equipped with a 1.6 liter TDI diesel engine. This turbocharged engine develops 77 kW (105 hp) at 4,400 rpm and 250 Nm (184.39 lb-ft) of torque, while the fuel consumption figure is 3.8 liters of diesel per 100 km (61.90 US mpg). But that’s not the best thing about it!It emits only 99 grams of CO2 per kilometer (159.33 g/mile)!

Audi has used some clever tricks in this A3 to save fuel. For example the start-stop system that turns the engine off as soon as the vehicle comes to a stop, the shift lever is in neutral, and the driver has removed their foot from the clutch pedal. Start-stop then turns the engine back on as soon as the clutch pedal is depressed.

Also during braking and coasting phases, the energy-recovery system intelligently controls the alternator to recover energy, which is temporarily stored in the battery. This energy is then fed back into the electrical system during acceleration — thus reducing the load on the alternator. That saves fuel. The energy-recovery system and the start-stop system unleash their full potential under city-driving conditions.

Usually with extremely efficient cars you expect the performance to be rubbish! And it is! nought to 100 km/h takes 11.4 seconds in this car and it can only reach a top speed of 190 km/h. Of course for an economy minded driver this numbers are way beyond his needs but for normal human being it’s slow!