Which performance metric does the VTEC system on the Honda engine primarily improve?

The VTEC (Variable Valve Timing and Lift Electronic Control) system on Honda engines is primarily designed to enhance fuel efficiency by optimizing the engine's performance across different RPMs. By adjusting the timing and lift of the intake valves, VTEC enables the engine to operate more effectively at both low and high speeds. When the engine operates in its low RPM range, VTEC uses a cam profile that promotes fuel efficiency and smoother operation. Once the RPMs increase, VTEC activates a different cam profile that allows for greater power and performance without sacrificing fuel economy. This dual functionality helps ensure that the engine is efficient under various driving conditions, making it a key feature for improving overall fuel efficiency.