Yeah, try to start the grade with as much speed as possible, hold as much throttle as possible without disengaging overdrive. When it does disengage, reduce throttle and speed to lowest throttle position that will keep you going up the hill without losing momentum.
Gain as much kinetic energy on level ground as possible to then convert it to potential energy. If the kinetic energy isn't enough to get you to the top of the hill, you must expend extra chemical energy.
Just for fun, hour much easier would the grade be if you reduced the mass of your car by removing the spare tire, or rear seat temporarily?
Is there really no alternate route?
__________________
|