1. A system, comprising: a combustion engine operable to produce movement, the movement represented by a value of an operational parameter of the combustion engine; an electric machine having at least one portion coupled to the combustion engine to be driven in response to the movement produced by the combustion engine and to produce electrical power in response; and a control subsystem communicatively coupled to control the combustion engine and the electric machine at least in part in response to a plurality of received throttle input signals that are indicative of a finite number of distinct throttle settings, each of the throttle settings associated with a respective range of available horsepower delivered as electrical power via the electric machine, wherein the control subsystem in response to an adjustment in the throttle setting selectively maintains the value of the operational parameter of the combustion engine where an amount of horsepower associated with the adjusted throttle setting is available without a change in the value of the operational parameter of the combustion engine, and selectively changes the value of the operational parameter of the combustion engine where the amount of horsepower associated with the adjusted throttle setting is not available without the change in the value of the operational parameter of the combustion engine.