It is hard to put a definitive number on what can be considered "high mileage" for a 6.6 Duramax, since some years were better than others.It's fair to assume that a well-kept 6.6L Duramax will go ...

Some 6.6-liter Duramax turbodiesel owners have even considered an EGR delete, effectively removing the valve and components that can clog. You can delete a diesel truck, but it's a bad idea for ...

In terms of fuel economy, the winner hands-down is the 3.0L turbo-diesel Duramax, with up to 29 mpg highway in the Silverado 1500. According to Fuelly, a 6.6L turbo-diesel Duramax-equipped Sierra ...

A new, 36-gallon (136 L) fuel tank is standard on all models and, with the improved fuel efficiency of the powertrains, enables a cruising range of up about 680 miles (1,090 km) with the Duramax 6.6L.