In order to allow the powertrain computer to optimize performance under every driving condition, the Insight's accelerator pedal is a “drive-by-wire” type that uses an electronic position sensor instead of the conventional metal cable that usually connects the pedal to the engine's throttle body. In the drive-by-wire system, the engine's throttle body is controlled by the powertrain computer in response to the accelerator pedal position—allowing the computer to determine the optimal throttle body, fuel, and CVT settings based on the accelerator pedal position and its rate of travel.