2024 Chevy Duramax Mpg. The duramax diesel engine and its insane torque is the best thing about this truck. Current truck is a 2014 duramax with the 6 speed.

Though chevy’s and gmc’s 6.6 liter 6600 duramax diesel remains one of the most popular engines around, how much mpg can it really average? Our truck tips the scales at 5,770 pounds, with a full tank of fuel and no occupants.