6.0L Vortec V8 LIVC SFI with Variable Valve Timing

This technology offers an EPA-estimated 20 mpg city and 23 mpg highway.

Here's more on how this engine works:

  • At low speeds and light loads, Yukon Hybrid can reduce fuel consumption by shutting off the engine and operating on electric power alone.
  • During normal stops, regenerative braking uses the motors in the hybrid transmission as generators to decelerate the vehicle by applying resistance in the motors rather than brake friction. At the same time, the motors are capturing that energy as electricity in the 300-volt battery pack, electricity that is available for the next acceleration cycle.
  • When extra power isn't needed, such as cruising at highway speeds, Active Fuel Management deactivates four of the eight cylinders to become a V4. For passing, trailering or hilly terrain, pressing the accelerator can reactivate all eight cylinders in milliseconds. For even greater power when necessary, the electric drive system can engage automatically for extra torque.
  • Yukon Hybrid packs a lot of power in a small space, thanks to its 300-volt Nickel-Metal Hydride battery pack. Its technology stores power so efficiently that the complete battery pack fits under the second row seat between the strong steel frame rails, leaving passenger and cargo volume unaffected.