The introduction of Audi's 2.0-litre TDI Piezo injection engine for the A5 enhances a vehicle range already with a strong diesel line-up but one which is now cleaner, more fuel efficient and every bit as well performing as its siblings.

Audi's A5 is already available in a wide variety of petrol and diesel engine options, but not until now has it included a four cylinder diesel variant. And so it is with a 2.0-litre TDI engine that the A5 becomes even cleaner and efficient, boasting an impressive 53 miles to the gallon on the combined cycle - most importantly whilst remaining uncompromising on performance.

Priced at £28,485 and £30,010 on the road for front-wheel-drive and quattro versions respectively, the new A5 2.0 TDI will reach the first UK customers next March, coinciding with the launch of an even more striking S line trim priced at £2,250. Available across the range, the new trim includes exterior and interior styling enhancements, 18-inch S line alloys, sports suspension and xenon lamps with LED daylight running.

The new A5 TDI model adopts the most powerful version of the 2.0-litre powerplant, producing 170 PS and first seen in the A4 range. Utilising a Piezo injection system, the unit generates 350 Nm of torque at an impressive 1,750 rpm.

Pitting the new A5 model against its 2.7-litre TDI sibling and there's little in it for the figures - at least bar efficiency. The 0-62 mph sprint is reached in 8.3 seconds (7.4s for the 2.7) and a top speed of 140 mph is only just short of the higher model's 144 mph. Pulling away from its higher-powered siblings is the fuel consumption figure, the 2.0-litre model offering a 20 percent or 9 mpg (combined) advantage over the 44 mpg-achieving 2.7-litre TDI. CO2 output is 140 g/km - now the lowest in the A5 range.

For all the details including specification for the new A5 S line package, see the Press Release.

Gallery: Audi A5 2.0 TDI Announced for UK