I don't think it can work perfectly in any manual car let alone tiny 4-cylinders. The transmission be it manual or auto is independent of the cruise control, so an auto tranny car can upshift or downshift as required by terrain (uphill or downhill) or other resistances and only disengages when the driver hits the brakes. In case of downhill overtaking the car may shift to a lower gear if the driver is increasing speed to overtake; on releasing the accelerator pedal the cruise control remains engaged and the car shifts automatically in a higher gear. This is not possible in manual.
On the other hand, cruise control on a manual car is disengaged not only by the brake pedal, but also by the clutch pedal, so if the car needs to be in a different gear in order to maintain speed, then the transmission can't do it on its own and the driver will have to do it by using the clutch. So in short cruise in manual only works for a certain speed in a certain gear that is usually a high gear.
Not the same i think. Please enlighten me if I'm wrong.
