Audi improves engine's fuel economy

The German car giant Audi has announced it will replace the 5.2-litre V10 engine with a twin-turbo 4.0-litre V8 in its new S8 and S6 super-saloons.

The move comes as a result of a need to meet emissions targets as well as consumer demand and the engine should offer up to a 25% improvement in fuel economy alongside enhanced power and performance.

The significant improvements in fuel economy are possible because of the use of a cylinder deactivation system, which temporarily turns the car into a V4 by disabling four of the V8's cylinders when the engine load is light.

The flagship S8 model offers 513bhp and 479lb.ft, enabling it to do 0-62mph in as little as 4.2 seconds. And the S6 saloon and Avant and the S7 Sportback all get up to 62mph in less than five seconds thanks to a 414bhp, 406lb.ft version.

Despite this power and performance, all four models do 30mpg according to the standard European fuel economy tests, have a CO2 output of between 225g/km and 235g/km and make use of active noise cancelling under light loads.

Aside from the S8, the S7 is the more expensive option at £61,995 with the S6 saloon and Avant costing £53,995 and £56,050 respectively.

Copyright © Press Association 2012