In contrast with Ford, Chevy is still all-in on V8s for its full-size pickups, but don't take this to mean that the Silverado's engines are low-tech. The 5.3- and 6.2-liter V8s offered in the 2019 Silverado offer a new fuel-saving technology that can shut off seven cylinders at once. This system is called Dynamic Fuel Management, and it's as interesting as its name is boring. Jason Fenske of Engineering Explained tackles Dynamic Fuel Management in his latest video, explaining how it works, and why specifically it saves fuel.
In the Silverado's V8s, all of the valves are attached to deactivation arms, which can be moved by a locking pin. With the locking pin pushed all the way out, the valves operate normally, but when retracted, the valves are kept shut, effectively deactivating the cylinder.
The engine management system decides how many cylinders are deactivated and when this occurs. The advantage here is a reduction in pumping losses. Basically, it's more efficient to use one cylinder to make a certain amount of power than it is to have multiple do the same work.
We haven't yet driven the new Silverado, so we don't know how the system works in the real world, but it's still fascinating tech. Check out Fenske's videos for an even more in-depth explanation.