First sentence of the picture says "Pressing the transmission control switch on the side of the gearshift lever activates Grade Assist and cancels Overdrive".
Last sentence says "It is recommended that you return to O/D (overdrive mode) on flat terrain to provide the best fuel economy and transmissio function". The Grade Assist button is a dual function button. Turns on Grade Assist and turns off O/D. Press it a second time and it turns off Grade Assist and turns on O/D. At least that is how I read it.
My Edge has manual mode and the button on the side of the shift lever is for manual shifting, so I will have to read about Grade Assist for my car.
