ORDER books have opened for the third diesel variant in the new Audi A6 range. It promises the lowest tax liability and running costs for six-cylinder diesels in the premium sector.

The 2.7 TDI uses a 180bhp V6 engine producing 280lb-ft of torque from 1,400rpm, claiming 41.5mpg on the combined cycle with carbon dioxide emissions of 181g/km. The 2.7 TDI will be priced from £26,330 on-the-road for the SE, with S-line starting at £29,050.