
VCM II enables cylinders to be shut off at cruising speeds in order to increase highway mileage. Fuel efficiency is enhanced by lower-friction piston rings, the ability to run on lower viscosity oil and transmission fluid, and other friction-reducing features.
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i-VTEC, which stands for Variable valve Timing and Electronic lift Control, enables the intake valves to open deeper and longer when the engine reaches approximately 4500 rpm to enhance airflow and allow the RDX to continue to build horsepower at levels where other engines may run out of steam.

All-aluminum construction, a hollow camshaft, and other weight-saving measures keep the engine lighter for better handling. The Drive-by-Wire throttle system provides a precise balance of smooth and responsive operation by adjusting throttle sensitivity to varying driving conditions.

Noise vibration and harshness is reduced by the use of a timing chain and dual balance shafts, as well as a rigid aluminum-alloy die-cast block, aluminum head and oil pan.

The front-drive model delivers an efficient EPA Estimated Fuel Economy of 20 / 28 / 2327 city/highway/combined, while the AWD model does nearly as well with 19 / 27 / 22 highway.
