2024 6.6l Duramax Turbo-Diesel V8 Engine Mpg. Complete information, specs, power and torque ratings on gm's 6.6l l5p v8 turbo diesel duramax engine used in the chevy silverado hd and gmc sierra hd. Yes it has to shift down a few times compared to the duramax and instead of averaging 10 mpg it gets more like 8.
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. But up here diesel is also about 50 cents more per.