Optional equipment like collision and lane-departure warning systems make the trucks safer, assuming the right boxes are checked off on the order form. They're also more aerodynamic, but with a coefficient of drag just this side of a barn, nobody buys a half-ton pickup for its sleek shape. Powering the new Silverado/Sierra is a new family of EcoTec3 engines. Unlike Ford
's EcoBoost range, these engines aren't turbocharged, but do for the first time in a GM pickup include direct injection, as well as variable cylinder deactivation, continuously variable valve timing and aluminum blocks to make them more fuel-efficient - an increasing demand even among truck buyers.