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Hills are energy storage. I try to store energy as efficiently as I can. That means highest gear the car can hold an acceptable speed in at an RPM that makes enough power to get it done without going into open loop.
I try to recoup that energy as efficiently as I can which means if the grade allows I do it which mean without running the engine in an inefficient way ( high vac low load) or any form of braking.
End result is that I pulse up and glide down. If the grade is so shallow that I lose a significant amount of speed I will pulse down with short pulses and long glides. If it is so steep that I begin to get up to an unsafe speed I will preemptively engine brake (DFCO) and brake.
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Learn from the mistakes of others, that way when you mess up you can do so in new and interesting ways.
One mile of road will take you one mile, one mile of runway can take you around the world.
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