What Is the MPG of the 6.6 Duramax Diesel?

Even though it's a diesel engine, the 6.6-liter Duramax rates poorly in terms of mileage due to its 8-cylinder engine, but the torque it provides makes it useful in trucks. First released in 2001 Chevrolet vehicles, the engine has seen improvements in power and torque over the years, and some Chevrolet vans and other vehicles offer it as an option for buyers looking for a more powerful engine.