The all new Audi A6 opens for orders in the UK in January 2011The Audi A6 2.0 TDI (177PS) manual is the most efficient derivative achieving 0-62mph in 8.7 second and capable of a top speed of142mph. The Audi A6 2.0 TDI emits just 129g/km CO2 emissions. More familiar options such as the Audi side assist blind spot warning system and the Audi lane assist lane departure detection system will also be