The engine utilises cylinder deactivation so it can run as a V4 for better fuel economy.

Variable-valve timing and cylinder deactivation are technologies that allow the engine to use only the fuel it needs, increasing efficiency.

The net effect of cylinder deactivation is an improvement in fuel economy and likewise a reduction in exhaust emissions.

In addition to modifications of the valve components, other vehicle systems must be altered to support cylinder deactivation.

In most instances, cylinder deactivation is applied to relatively large displacement engines that are particularly inefficient at light load.

There are currently two main types of cylinder deactivation used today, depending on the type of engine.

With computers this fast cylinder deactivation and reactivation occur almost instantly.

The 5.7-liter Hemi V8 was further updated for 2011 and also includes cylinder deactivation on manual models since.

Some of us expected better given the 5.7 V8's standard Multi-Displacement System cylinder deactivation.

Advertisements, he said, would stress technologies like cylinder deactivation, which shuts down engine cylinders when they are not needed.