Need an executive car with a quiet cabin

I want to buy an executive car with a quiet ride. This means minimal wind noise, tyre roar, engine noise and suspension thud. Have narrowed my search down to the BMW 5 series 520d SE, Audi A4 V6 3.0 218...

Will the Audi A4 really return 53mpg?

I was reading the engine specification for the new Audi A4 2.0 petrol auto. It just seems incredible. 53mpg. 0-62 in 7.3 secs. 190ps and yet only £30 per year in VED. What engineering wizardry have they...