Audi has confirmed the next-generation of S5, S6 and S7 performance cars will be powered by a diesel engine for the first time.

All of the models are due to arrive by the end of the year and will be powered by the firm’s 347hp 3.0-litre diesel unit along with a 48-volt mild hybrid system. The powertrain is mated to an eight-speed automatic gearbox and a four-wheel drive system.

All S TDI models meet the Euro 6 emissions standard. Fuel economy for the S6 TDI saloon ranges from 35.8 mpg to 36.2 mpg, equating to NEDC-correlated CO2 emissions of 164g/km. The figures for the S6 Avant are 34.9 mpg to 35.3 mpg and 171g/km, and for the S7 Sportback 35.3 mpg to 35.8 mpg and 170g/km.

S5 diesel

According to Audi, the hybrid system can reduce fuel consumption by as 0.4 litres every 62 miles and allows for the car to coast for up to 40 seconds when the throttle is shut off between 34 and 99mph. The engine management system decides whether coasting, freewheeling or recuperation – the recovery of kinetic energy – is most efficient and does this using information from the navigation system and the onboard sensors.

As standard, the car is fitted with LED headlights, S sport suspension and damping and power-adjustable front sport seats with Alcantara leather, embossed S logo and seat heating.

Technology fitted includes the firm’s virtual cockpit display system, while the navigation and infotainment systems are housed in an 8.3-inch screen. The system includes the Audi connect hardware module, which connects the car to the internet via LTE and also includes a Wi-Fi hotspot. It also delivers a number of internet services to the car, including traffic information and remote functions.