A 4.3-liter V6 and a 6.2-liter V8 will also be offered in GM’s trucks, but performance numbers are still unreleased. The rear-wheel drive 5.3-liter V8 is rated at 16/23/19 mpg city/highway ...

The turbocharged 2.7-liter four-cylinder engine is about half the size of its big brother — GM's stalwart 5.3-liter V8 — but it can cover much of the same ground. With increased torque for ...