Abstract: A throttle motion control device for an automotive vehicle engine is used to warn the driver of excessive fuel consumption by providing a stiff accelerator pedal feel when manifold vacuum drops below a given predetermined value, this being effected by means of a vacuum motor operatively connected to the accelerator pedal to apply a predetermined constant force on the accelerator pedal in the opposite direction to that applied by the driver to open the throttle, a vacuum signal being applied to the vacuum motor through a vacuum control valve from the intake manifold of the engine, the vacuum control valve opening below a preselected economical vacuum and, a vacuum regulator is interposed between the vacuum motor and the vacuum control valve to maintain the vacuum signal applied to the vacuum motor at a preselected value.