Here comes a battle of the giants, between the 2014 Audi RS6 Avant and the 2014 Mercedes E63 AMG Estate. The 2014 Audi RS6 Avant is powered by a 4.0 TFSI twin-turbo V8 engine that spits out 560 hp and 700 Nm of torque. The 2014 RS6 Avant can get from zero to 62 mph (100 km/h) in 3.9 seconds. It can reach a top speed of 189.52 mph (305 km/h) and at the same time, it can offer 1,680-liter (59.33 cu ft) of luggage space. The 2014 Mercedes E63 AMG on the other hand, is powered by a 5.5-litre V8 biturbo engine that's good for 557 hp and 720 Nm of torque. The 2014 E63 AMG Estate needs 3.8 seconds to reach 62 mph (100 km/h) and it can reach a maximum speed of just 155 mph (250 km/h).