Mercedes-Benz E320 Bluetec is the hands-down MPG winner in the Luxury Sedan class. Mated to an electronically controlled seven-speed automatic transmission, the E320's 24-valve 3.0 liter V-6 diesel engine, delivers a very respectable 23 city and 32 highway miles per gallon. With 208 horsepower (at 3,800 rpm) and net torque of 388 lb-ft (between 1,600 and 2,400 rpm) the MB E320 has plenty of ooomph off the line and on the highway.Decade after decade, Mercedes-Benz's diesel-powered sedans have set the standard for fuel economy with luxury. The E320 Bluetec, along with its 4WD SUV diesel-powered brothers -- GL320 CDI, ML320 CDI SUV, and R320 CDI SUV -- give all every other automaker something to shoot for ... should those manufacturers ever get off their duffs and choose to compete in an American marketplace hungry for the ever-obvious benefits of domestically produced biodiesel.
