IM I RIGHT IN THINKING IF I PRESS THE ECON BUTTON SO THE RED LIGHT IS ON, THE CAR WILL SAVE ON FUEL AND ALSO HAVE MORE POWER,SURELY WHEN THE LIGHT IS OFF IT MEANS THE AIRCON IS CONSTANTLY RUNNING SO IN THEORY USING FUEL AND SAPPING A BIT OF THE CARS POWER EXSPECIALLY WHEN THE FANS ARE CONSTANTLY RUNNING ASWELL??