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Maybe I am missing something but most uphill climbs have a downhill stretch later, unless you are climbing to a plateau and not coming back down.
In fact I have had good success with getting better mileage in certain grade scenarios than on flat ground. I think atmospheric pressure drops 50% at 18,000 feet, but lower atmospheric pressure is like a governor in a diesel, as long as you have enough power to climb the grade.
regards
Mech
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