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Drop down a gear to climb the hills, coast downhill. When you don't need 4th use 5th or even better coast. Might try downshift pulsing uphill then peak speed coasting as far as you can downhill. Ay a certain grade and speed you car should downshift, unless you get peak speed at the bottom and bleed it off up the next hill.
It all depends on length and grade.
regards
Mech
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