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I do about 60~65 up the steepest of mountains, making sure the torque converter stays locked and the transmission stays in top gear. When I get to the crest, I put it in neutral so it will coast down to about 50 before it starts accelerating from going down again. Then I will let it coast up to as fast of a speed as I am comfortable with (true speed limit) before putting it back in gear to get DFCO and control my speed. I never ever brake through the mountains.
I plan to do a test using this method with my car empty, and my car with 500 lbs of extra weight in it, and see what kind of differences there are.
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