The Chevrolet Silverado HD and GMC Sierra HD may have gained all-new generations for the 2020 model year, but the latest 2021 model year still brings some important changes for both nameplates. On the mechanical side of the equation, the most notable changes to the 2021 Chevrolet Silverado HD and 2021 GMC Sierra HD is the addition of FlexFuel capability.
GM Authority was the first to cover this news, and now, we’re taking a closer look in the following post.
Both the 2021 Chevrolet Silverado HD and 2021 GMC Sierra HD come with E85 FlexFuel capability for the new 6.6L V8 L8T gas engine. Previously, this engine was gasoline only.
Output from the L8T is rated at 401 horsepower and 464 pound-feet of torque, with the GM six-speed automatic handling the transmission duties.
For 2021 GMC Sierra HD models, this option is only available on base models (1SA) and requires the JL1 trailer brake controller. The FlexFuel capability option also requires the Convenience Package on Regular cab models, and is not available with the pickup box delete option.
Meanwhile, the 2021 Chevrolet Silverado HD offers FlexFuel capability exclusively on the Work Truck trim level with the Regular Cab body configuration. It too requires the JL1 trailer brake controller, and is not available with the pickup box delete option.
For those who may be unaware, FlexFuel-capable engines are designed to run on E85 ethanol, gasoline, or any combination thereof. Generally speaking, E85 ethanol fuel is less prone to detonation, and is considered cleaner than regular gasoline in terms of emissions. Additionally, E85 ethanol can be made from sugar cane or corn, which makes it a great alternative to sourcing imported oil.
Back in 2010, General Motors doubled down on its FlexFuel commitment by ramping up the number of vehicles that offered the feature, putting millions of FlexFuel-capable SUVs and trucks on the road. These days, the automaker has shifted its focus to all-electric vehicles, but the addition of FlexFuel capability to the 2021 Chevrolet Silverado HD and 2021 GMC Sierra HD will surely make the workhorses even more attractive for those customers sticking with internal combustion.