2024 Chevy 6.6 Duramax Mpg. General motors announced a revised, more powerful version of the 6.6l duramax diesel for the updated 2024 model year gmc sierra and chevrolet silverado hd. New interior on lt/sle and up, same as half tons except the.

The 2024 silverado 2500 duramax diesel achieved a result of 18 mpg in our testing. Other news, the 6.6 gasser gets the big 10 speed for 2024 and some new color and trim options.