With air suspension and roomy interiors, you don't feel that the car is moving. The Audi A6 35 TDI has a creamy 2.0L turbocharged diesel engine that is known for its frugal nature and longevity. I'd say, if you want something between a spirited 5 series and luxurious E-Klasse, get the A6. Also, it does not go to 300 km/h!