An improved vehicular speed control system (40) is provided that includes a logic member (2) operative to receive and process a gear ratio position signal (14) and either a vehicle speed signal (6) or an engine speed signal (7) and provide an output control signal (21) to an actuator (22) operative to control the engine throttle (24) or the like to maintain vehicular speed only when certain predetermined optimum gear ratios are engaged by an operator of the vehicle.
