At a base price of $48,600, the E350 sedan is powered by a 3.5-liter V6 that produces 268 horsepower and 258 pound-feet of torque, and is expected to get 18 city / 25 highway. The upgraded E550, at $56,300, is powered by a 5.5-liter V8 producing 382 horsepower and 391 pound-feet of torque, and is expected to get 16 city / 23 highway. There will also be a BlueTEC clean diesel V6 available in March of 2010 that is expected to get a solid 24 city / 33 highway.