In the case of the 5.3-liter V8, DFM translates to one mile to the gallon more driving range on the combined cycle versus the previous generation with AFM and the eight-speed automatic transmission.

According to GM spokeswoman Michelle Malcho, the omission of AFM and DFM technologies on 2021 Chevy Silverado 1500 and 2021 GMC Sierra 1500 models is expected to lower fuel economy by about 1 mpg.